{"id":2027,"date":"2023-05-05T10:45:58","date_gmt":"2023-05-05T02:45:58","guid":{"rendered":"\/?p=2027"},"modified":"2023-05-05T10:45:58","modified_gmt":"2023-05-05T02:45:58","slug":"java%e5%ae%89%e5%85%a8%e6%8c%87%e5%8d%97","status":"publish","type":"post","link":"\/?p=2027","title":{"rendered":"Java\u5b89\u5168\u6307\u5357"},"content":{"rendered":"

\u5b89\u5353\u7c7b<\/h2>\n

<\/a><\/p>\n

I. \u4ee3\u7801\u5b9e\u73b0<\/h3>\n

<\/a><\/p>\n

1.1 \u5f02\u5e38\u6355\u83b7\u5904\u7406<\/h4>\n
1.1.1 \u3010\u5fc5\u987b\u3011\u5e8f\u5217\u5316\u5f02\u5e38\u6355\u83b7<\/h5>\n

\u5bf9\u4e8e\u901a\u8fc7\u5bfc\u51fa\u7ec4\u4ef6 intent \u4f20\u9012\u7684\u5e8f\u5217\u5316\u5bf9\u8c61\uff0c\u5fc5\u987b\u8fdb\u884c try...catch \u5904\u7406\uff0c\u4ee5\u907f\u514d\u6570\u636e\u975e\u6cd5\u5bfc\u81f4\u5e94\u7528\u5d29\u6e83\u3002 <\/p>\n

public class MainActivity extends Activity {\n\n    protected void onCreate(Bundle savedInstanceState) {\n        try {\n            Intent mIntent = getIntent(); \n            \/\/String msg = intent.getStringExtra("data"); \n            Person mPerson = (Person)mIntent.getSerializableExtra(ObjectDemo.SER_KEY)\n            \/\/textView.setText(msg); \n        } catch (ClassNotFoundException exp) {\n            \/\/ ......\n        }\n    }\n}<\/code><\/pre>\n
1.1.2 \u3010\u5fc5\u987b\u3011NullPointerException \u5f02\u5e38\u6355\u83b7<\/h5>\n
\u5bf9\u4e8e\u901a\u8fc7 intent getAction \u65b9\u6cd5\u83b7\u53d6\u6570\u636e\u65f6\uff0c\u5fc5\u987b\u8fdb\u884c try...catch \u5904\u7406\uff0c\u4ee5\u907f\u514d\u7a7a\u6307\u9488\u5f02\u5e38\u5bfc\u81f4\u5e94\u7528\u5d29\u6e83\u3002<\/p>\n
public class MainActivity extends Activity {\n\n    protected void onCreate(Bundle savedInstanceState) {\n        try {\n            Intent mIntent = getIntent(); \n            if mIntent.getAction().equals("StartNewWorld") {\n                \/\/ ......\n            }\n            \/\/ ......\n        } catch (NullPointerException exp) {\n            \/\/ ......\n        }\n    }\n}<\/code><\/pre>\n
1.1.3 \u3010\u5fc5\u987b\u3011ClassCastException \u5f02\u5e38\u6355\u83b7<\/h5>\n
\u5bf9\u4e8e\u901a\u8fc7 intent getSerializableExtra \u65b9\u6cd5\u83b7\u53d6\u6570\u636e\u65f6\uff0c\u5fc5\u987b\u8fdb\u884c try...catch \u5904\u7406\uff0c\u4ee5\u907f\u514d\u7c7b\u578b\u8f6c\u6362\u5f02\u5e38\u5bfc\u81f4\u5e94\u7528\u5d29\u6e83\u3002<\/p>\n
public class MainActivity extends Activity {\n\n    protected void onCreate(Bundle savedInstanceState) {\n        try {\n            Intent mIntent = getIntent(); \n            Person mPerson = (Person)mIntent.getSerializableExtra(ObjectDemo.SER_KEY)\n            \/\/ ......\n        } catch (ClassCastException exp) {\n            \/\/ ......\n        }\n    }\n}<\/code><\/pre>\n
1.1.4 \u3010\u5fc5\u987b\u3011ClassNotFoundException \u5f02\u5e38\u6355\u83b7<\/h5>\n
\u540c 1.1.3<\/p>\n
<\/a><\/p>\n
1.2 \u6570\u636e\u6cc4\u9732<\/h4>\n
1.2.1 \u3010\u5fc5\u987b\u3011logcat \u8f93\u51fa\u9650\u5236<\/h5>\n
release \u7248\u672c\u7981\u6b62\u5728 logcat \u8f93\u51fa\u4fe1\u606f\u3002<\/p>\n
public class MainActivity extends Activity {\n    String DEBUG = "debug_version";\n\n    protected void onCreate(Bundle savedInstanceState) {\n        \/\/ ......\n        if (DEBUG == "debug_version") {\n            Log.d("writelog", "start activity");\n        }\n        \/\/ ......\n    }\n}<\/code><\/pre>\n
<\/a><\/p>\n
1.3 webview \u7ec4\u4ef6\u5b89\u5168<\/h4>\n
1.3.1 \u3010\u5fc5\u987b\u3011addJavaScriptInterface \u65b9\u6cd5\u8c03\u7528<\/h5>\n
\u5bf9\u4e8e\u8bbe\u7f6e minsdk <= 18 \u7684\u5e94\u7528\uff0c\u7981\u6b62\u8c03\u7528 addJavaScriptInterface \u65b9\u6cd5\u3002<\/p>\n
public class MainActivity extends Activity {\n\n    protected void onCreate(Bundle savedInstanceState) {\n        \/\/ ......\n        mWebView = new WebView(this);\n        if (Build.VERSION.SDK_INT > 18) {\n            mWebView.addJavascriptInterface(new wPayActivity.InJavaScriptLocalObj(this), "local_obj");\n        }\n        \/\/ ......\n    }\n}<\/code><\/pre>\n
1.3.2 \u3010\u5efa\u8bae\u3011setJavaScriptEnabled \u65b9\u6cd5\u8c03\u7528<\/h5>\n
\u5982\u975e\u5fc5\u8981\uff0csetJavaScriptEnabled \u5e94\u8bbe\u7f6e\u4e3a false \u3002\u52a0\u8f7d\u672c\u5730 html \uff0c\u5e94\u6821\u9a8c html \u9875\u9762\u5b8c\u6574\u6027\uff0c\u4ee5\u907f\u514d xss \u653b\u51fb\u3002<\/p>\n
public class MainActivity extends Activity {\n\n    protected void onCreate(Bundle savedInstanceState) {\n        \/\/ ......\n        mWebView = new WebView(this);\n        mWebView.getSettings().setJavaScriptEnabled(false);\n        \/\/ ......\n    }\n}<\/code><\/pre>\n
1.3.3 \u3010\u5efa\u8bae\u3011setAllowFileAccess \u65b9\u6cd5\u8c03\u7528<\/h5>\n
\u5efa\u8bae\u7981\u6b62\u4f7f\u7528 File \u57df\u534f\u8bae\uff0c\u4ee5\u907f\u514d\u8fc7\u6ee4\u4e0d\u5f53\u5bfc\u81f4\u654f\u611f\u4fe1\u606f\u6cc4\u9732\u3002<\/p>\n
public class MainActivity extends Activity {\n\n    protected void onCreate(Bundle savedInstanceState) {\n        \/\/ ......\n        mWebView = new WebView(this);\n        mWebView.getSettings().setAllowFileAccess(false);\n        \/\/ ......\n    }\n}<\/code><\/pre>\n
1.3.4 \u3010\u5efa\u8bae\u3011setSavePassword \u65b9\u6cd5\u8c03\u7528<\/h5>\n
\u5efa\u8bae setSavePassword \u7684\u8bbe\u7f6e\u4e3a false \uff0c\u907f\u514d\u660e\u6587\u4fdd\u5b58\u7f51\u7ad9\u5bc6\u7801\u3002<\/p>\n
public class MainActivity extends Activity {\n\n    protected void onCreate(Bundle savedInstanceState) {\n        \/\/ ......\n        mWebView = new WebView(this);\n        mWebView.getSettings().setSavePassword(false);\n        \/\/ ......\n    }\n}<\/code><\/pre>\n
1.3.5 \u3010\u5fc5\u987b\u3011onReceivedSslError \u65b9\u6cd5\u8c03\u7528<\/h5>\n
webview \u7ec4\u4ef6\u52a0\u8f7d\u7f51\u9875\u53d1\u751f\u8bc1\u4e66\u8ba4\u8bc1\u9519\u8bef\u65f6\uff0c\u4e0d\u80fd\u76f4\u63a5\u8c03\u7528 handler.proceed() \u5ffd\u7565\u9519\u8bef\uff0c\u5e94\u5f53\u5904\u7406\u5f53\u524d\u573a\u666f\u662f\u5426\u7b26\u5408\u4e1a\u52a1\u9884\u671f\uff0c\u4ee5\u907f\u514d\u4e2d\u95f4\u4eba\u653b\u51fb\u52ab\u6301\u3002<\/p>\n
public class MainActivity extends Activity {\n\n    protected void onCreate(Bundle savedInstanceState) {\n        \/\/ ......\n        mWebView = new WebView(this);\n        mWebView.setWebViewClient(new WebViewClient() {\n            @Override\n            public void onReceivedSslError(WebView view, SslErrorHandler handler, SslError error) {\n                \/\/ must check error \n                check_error();\n                handler.proceed();\n            }\n        }\n        \/\/ ......\n    }\n}<\/code><\/pre>\n
<\/a><\/p>\n
1.4 \u4f20\u8f93\u5b89\u5168<\/h4>\n
1.4.1 \u3010\u5fc5\u987b\u3011\u81ea\u5b9a\u4e49 HostnameVerifier \u7c7b<\/h5>\n
\u81ea\u5b9a\u4e49 HostnameVerifier \u7c7b\u540e\uff0c\u5fc5\u987b\u5b9e\u73b0 verify \u65b9\u6cd5\u6821\u9a8c\u57df\u540d\uff0c\u4ee5\u907f\u514d\u4e2d\u95f4\u4eba\u653b\u51fb\u52ab\u6301\u3002<\/p>\n
public class MainActivity extends Activity {\n\n    protected void onCreate(Bundle savedInstanceState) {\n        \/\/ ......\n        HostnameVerifier hnv = new HostnameVerifier() {\n            @Override\n            public boolean verify(String hostname, SSLSession session) {\n                \/\/ must to do\n                isValid = checkHostName(hostname);\n                return isValid;\n            }\n        };\n        \/\/ ......\n    }\n}<\/code><\/pre>\n
1.4.2 \u3010\u5fc5\u987b\u3011\u81ea\u5b9a\u4e49 X509TrustManager \u7c7b<\/h5>\n
\u81ea\u5b9a\u4e49 X509TrustManager \u7c7b\u540e\uff0c\u5fc5\u987b\u5b9e\u73b0 checkServerTrusted \u65b9\u6cd5\u6821\u9a8c\u670d\u52a1\u5668\u8bc1\u4e66\uff0c\u4ee5\u907f\u514d\u4e2d\u95f4\u4eba\u653b\u51fb\u52ab\u6301\u3002<\/p>\n
public class MainActivity extends Activity {\n\n    protected void onCreate(Bundle savedInstanceState) {\n        \/\/ ......\n        TrustManager tm = new X509TrustManager() {\n            public void checkServerTrusted(X509Certificate[] chain, String authType)\n                    throws CertificateException {\n                \/\/ must to do\n                check_server_valid();\n            }\n        };\n        \/\/ ......\n    }\n}<\/code><\/pre>\n
1.4.3 \u3010\u5fc5\u987b\u3011setHostnameVerifier \u65b9\u6cd5\u8c03\u7528<\/h5>\n
\u7981\u6b62\u8c03\u7528 setHostnameVerifier \u65b9\u6cd5\u8bbe\u7f6e ALLOW_ALL_HOSTNAME_VERIFIER \u5c5e\u6027\uff0c\u4ee5\u907f\u514d\u4e2d\u95f4\u4eba\u653b\u51fb\u52ab\u6301\u3002<\/p>\n
public class MainActivity extends Activity {\n\n    protected void onCreate(Bundle savedInstanceState) {\n        \/\/ ......\n        SchemeRegistry schemeregistry = new SchemeRegistry();\n        SSLSocketFactory sslsocketfactory = SSLSocketFactory.getSocketFactory();\n        \/\/ set STRICT_HOSTNAME_VERIFIER\n        sslsocketfactory.setHostnameVerifier(SSLSocketFactory.STRICT_HOSTNAME_VERIFIER);\n        \/\/ ......\n    }\n}<\/code><\/pre>\n
<\/a><\/p>\n
II. \u914d\u7f6e&\u73af\u5883<\/h3>\n
<\/a><\/p>\n
2.1 AndroidManifest.xml \u914d\u7f6e<\/h4>\n
2.1.1 \u3010\u5fc5\u987b\u3011PermissionGroup \u5c5e\u6027\u8bbe\u7f6e<\/h5>\n
\u7981\u6b62\u8bbe\u7f6e PermissionGroup \u5c5e\u6027\u4e3a\u7a7a\u3002<\/p>\n
2.1.2 \u3010\u5fc5\u987b\u3011protectionLevel \u5c5e\u6027\u8bbe\u7f6e<\/h5>\n
\u5bf9\u4e8e\u81ea\u5b9a\u4e49\u6743\u9650\u7684 protectionLevel \u5c5e\u6027\u8bbe\u7f6e\uff0c\u5efa\u8bae\u8bbe\u7f6e\u4e3a signature \u6216 signatureOrSystem\u3002<\/p>\n
2.1.3 \u3010\u5efa\u8bae\u3011sharedUserId \u6743\u9650\u8bbe\u7f6e<\/h5>\n
\u6700\u5c0f\u8303\u56f4\u548c\u6700\u5c0f\u6743\u9650\u4f7f\u7528 sharedUserId \u8bbe\u7f6e\u3002<\/p>\n
2.1.4 \u3010\u5efa\u8bae\u3011allowBackup \u5907\u4efd\u8bbe\u7f6e<\/h5>\n
\u5982\u975e\u4ea7\u54c1\u529f\u80fd\u9700\u8981\uff0c\u5efa\u8bae\u8bbe\u7f6e allowBackup \u4e3a false\u3002<\/p>\n
<application android:allowBackup="false"> \n<\/application><\/code><\/pre>\n
2.1.5 \u3010\u5fc5\u987b\u3011debuggable \u8c03\u8bd5\u8bbe\u7f6e<\/h5>\n
release \u7248\u672c\u7981\u6b62\u8bbe\u7f6e debuggable \u4e3a true\u3002<\/p>\n
<application android:debuggable="false"> \n<\/application><\/code><\/pre>\n
<\/a><\/p>\n
\u540e\u53f0\u7c7b<\/h2>\n
<\/a><\/p>\n
I. \u4ee3\u7801\u5b9e\u73b0<\/h3>\n
<\/a><\/p>\n
1.1 \u6570\u636e\u6301\u4e45\u5316<\/h4>\n
1.1.1\u3010\u5fc5\u987b\u3011SQL\u8bed\u53e5\u9ed8\u8ba4\u4f7f\u7528\u9884\u7f16\u8bd1\u5e76\u7ed1\u5b9a\u53d8\u91cf<\/h5>\n
Web\u540e\u53f0\u7cfb\u7edf\u5e94\u9ed8\u8ba4\u4f7f\u7528\u9884\u7f16\u8bd1\u7ed1\u5b9a\u53d8\u91cf\u7684\u5f62\u5f0f\u521b\u5efasql\u8bed\u53e5\uff0c\u4fdd\u6301\u67e5\u8be2\u8bed\u53e5\u548c\u6570\u636e\u76f8\u5206\u79bb\u3002\u4ee5\u4ece\u672c\u8d28\u4e0a\u907f\u514dSQL\u6ce8\u5165\u98ce\u9669\u3002<\/p>\n
\u5982\u4f7f\u7528Mybatis\u4f5c\u4e3a\u6301\u4e45\u5c42\u6846\u67b6\uff0c\u5e94\u901a\u8fc7#{}\u8bed\u6cd5\u8fdb\u884c\u53c2\u6570\u7ed1\u5b9a\uff0cMyBatis \u4f1a\u521b\u5efa PreparedStatement<\/code> \u53c2\u6570\u5360\u4f4d\u7b26\uff0c\u5e76\u901a\u8fc7\u5360\u4f4d\u7b26\u5b89\u5168\u5730\u8bbe\u7f6e\u53c2\u6570\u3002<\/p>\n
\u793a\u4f8b\uff1aJDBC<\/p>\n
String custname = request.getParameter("name"); \nString query = "SELECT * FROM user_data WHERE user_name = ? ";\nPreparedStatement pstmt = connection.prepareStatement( query );\npstmt.setString( 1, custname); \nResultSet results = pstmt.executeQuery( );<\/code><\/pre>\n
Mybatis<\/p>\n
<select id="queryRuleIdByApplicationId" parameterType="java.lang.String" resultType="java.lang.String">    \n      select rule_id from scan_rule_sqlmap_tab where application_id=#{applicationId} \n<\/select>\n<\/code><\/pre>\n
\u5e94\u907f\u514d\u5916\u90e8\u8f93\u5165\u672a\u7ecf\u8fc7\u6ee4\u76f4\u63a5\u62fc\u63a5\u5230SQL\u8bed\u53e5\u4e2d\uff0c\u6216\u8005\u901a\u8fc7Mybatis\u4e2d\u7684${}\u4f20\u5165SQL\u8bed\u53e5\uff08\u5373\u4f7f\u4f7f\u7528PreparedStatement\uff0cSQL\u8bed\u53e5\u76f4\u63a5\u62fc\u63a5\u5916\u90e8\u8f93\u5165\u4e5f\u540c\u6837\u6709\u98ce\u9669\u3002\u4f8b\u5982Mybatis\u4e2d\u90e8\u5206\u53c2\u6570\u901a\u8fc7${}\u4f20\u5165SQL\u8bed\u53e5\u540e\u5b9e\u9645\u6267\u884c\u65f6\u8c03\u7528\u7684\u662fPreparedStatement.execute()\uff0c\u540c\u6837\u5b58\u5728\u6ce8\u5165\u98ce\u9669\uff09\u3002<\/p>\n
1.1.2\u3010\u5fc5\u987b\u3011\u767d\u540d\u5355\u8fc7\u6ee4<\/h5>\n
\u5bf9\u4e8e\u8868\u540d\u3001\u5217\u540d\u7b49\u65e0\u6cd5\u8fdb\u884c\u9884\u7f16\u8bd1\u7684\u573a\u666f\uff0c\u6bd4\u5982\u5916\u90e8\u6570\u636e\u62fc\u63a5\u5230order by, group by\u8bed\u53e5\u4e2d\uff0c\u9700\u901a\u8fc7\u767d\u540d\u5355\u7684\u5f62\u5f0f\u5bf9\u6570\u636e\u8fdb\u884c\u6821\u9a8c\uff0c\u4f8b\u5982\u5224\u65ad\u4f20\u5165\u5217\u540d\u662f\u5426\u5b58\u5728\u3001\u5347\u964d\u5e8f\u4ec5\u5141\u8bb8\u8f93\u5165\u201cASC\u201d\u548c\u201cDESC\u201d\u3001\u8868\u540d\u5217\u540d\u4ec5\u5141\u8bb8\u8f93\u5165\u5b57\u7b26\u3001\u6570\u5b57\u3001\u4e0b\u5212\u7ebf\u7b49\u3002\u53c2\u8003\u793a\u4f8b\uff1a<\/p>\n
public String someMethod(boolean sortOrder) {\n String SQLquery = "some SQL ... order by Salary " + (sortOrder ? "ASC" : "DESC");`\n ...<\/code><\/pre>\n
<\/a><\/p>\n
1.2 \u6587\u4ef6\u64cd\u4f5c<\/h4>\n
1.2.1\u3010\u5fc5\u987b\u3011\u6587\u4ef6\u7c7b\u578b\u9650\u5236<\/h5>\n
\u987b\u5728\u670d\u52a1\u5668\u7aef\u91c7\u7528\u767d\u540d\u5355\u65b9\u5f0f\u5bf9\u4e0a\u4f20\u6216\u4e0b\u8f7d\u7684\u6587\u4ef6\u7c7b\u578b\u3001\u5927\u5c0f\u8fdb\u884c\u4e25\u683c\u7684\u9650\u5236\u3002\u4ec5\u5141\u8bb8\u4e1a\u52a1\u6240\u9700\u6587\u4ef6\u7c7b\u578b\u4e0a\u4f20\uff0c\u907f\u514d\u4e0a\u4f20.jsp\u3001.jspx\u3001.class\u3001.java\u7b49\u53ef\u6267\u884c\u6587\u4ef6\u3002\u53c2\u8003\u793a\u4f8b\uff1a<\/p>\n
       String file_name = file.getOriginalFilename();\n        String[] parts = file_name.split("\\\\.");\n        String suffix = parts[parts.length - 1];\n        switch (suffix){\n            case "jpeg":\n                suffix = ".jpeg";\n                break;\n            case "jpg":\n                suffix = ".jpg";\n                break;\n            case "bmp":\n                suffix = ".bmp";\n                break;\n            case "png":\n                suffix = ".png";\n                break;\n            default:\n                \/\/handle error\n                return "error";\n        }<\/code><\/pre>\n
1.2.2\u3010\u5fc5\u987b\u3011\u7981\u6b62\u5916\u90e8\u6587\u4ef6\u5b58\u50a8\u4e8e\u53ef\u6267\u884c\u76ee\u5f55<\/h5>\n
\u7981\u6b62\u5916\u90e8\u6587\u4ef6\u5b58\u50a8\u4e8eWEB\u5bb9\u5668\u7684\u53ef\u6267\u884c\u76ee\u5f55\uff08appBase\uff09\u3002\u5efa\u8bae\u4fdd\u5b58\u5728\u4e13\u95e8\u7684\u6587\u4ef6\u670d\u52a1\u5668\u4e2d\u3002<\/p>\n
1.2.3\u3010\u5efa\u8bae\u3011\u907f\u514d\u8def\u5f84\u62fc\u63a5<\/h5>\n
\u6587\u4ef6\u76ee\u5f55\u907f\u514d\u5916\u90e8\u53c2\u6570\u62fc\u63a5\u3002\u4fdd\u5b58\u6587\u4ef6\u76ee\u5f55\u5efa\u8bae\u540e\u53f0\u5199\u6b7b\u5e76\u5bf9\u6587\u4ef6\u540d\u8fdb\u884c\u6821\u9a8c\uff08\u5b57\u7b26\u7c7b\u578b\u3001\u957f\u5ea6\uff09\u3002\u5efa\u8bae\u6587\u4ef6\u4fdd\u5b58\u65f6\uff0c\u5c06\u6587\u4ef6\u540d\u66ff\u6362\u4e3a\u968f\u673a\u5b57\u7b26\u4e32\u3002<\/p>\n
1.2.4\u3010\u5fc5\u987b\u3011\u907f\u514d\u8def\u5f84\u7a7f\u8d8a<\/h5>\n
\u5982\u56e0\u4e1a\u52a1\u9700\u8981\u4e0d\u80fd\u6ee1\u8db31.2.3\u7684\u8981\u6c42\uff0c\u6587\u4ef6\u8def\u5f84\u3001\u6587\u4ef6\u547d\u4e2d\u62fc\u63a5\u4e86\u4e0d\u53ef\u884c\u6570\u636e\uff0c\u9700\u5224\u65ad\u8bf7\u6c42\u6587\u4ef6\u540d\u548c\u6587\u4ef6\u8def\u5f84\u53c2\u6570\u4e2d\u662f\u5426\u5b58\u5728..\/\u6216..\\(\u4ec5windows)\uff0c \u5982\u5b58\u5728\u5e94\u5224\u5b9a\u8def\u5f84\u975e\u6cd5\u5e76\u62d2\u7edd\u8bf7\u6c42\u3002       <\/p>\n
<\/a><\/p>\n
1.3 \u7f51\u7edc\u8bbf\u95ee<\/h4>\n
1.3.1\u3010\u5fc5\u987b\u3011\u907f\u514d\u76f4\u63a5\u8bbf\u95ee\u4e0d\u53ef\u4fe1\u5730\u5740<\/h5>\n
\u670d\u52a1\u5668\u8bbf\u95ee\u4e0d\u53ef\u4fe1\u5730\u5740\u65f6\uff0c\u7981\u6b62\u8bbf\u95ee\u79c1\u6709\u5730\u5740\u6bb5\u53ca\u5185\u7f51\u57df\u540d\u3002<\/p>\n
\/\/ \u4ee5RFC\u5b9a\u4e49\u7684\u4e13\u6709\u7f51\u7edc\u4e3a\u4f8b\uff0c\u5982\u6709\u81ea\u5b9a\u4e49\u79c1\u6709\u7f51\u6bb5\u4ea6\u5e94\u52a0\u5165\u7981\u6b62\u8bbf\u95ee\u5217\u8868\u3002\n10.0.0.0\/8\n172.16.0.0\/12\n192.168.0.0\/16\n127.0.0.0\/8<\/code><\/pre>\n
\u5efa\u8bae\u901a\u8fc7URL\u89e3\u6790\u51fd\u6570\u8fdb\u884c\u89e3\u6790\uff0c\u83b7\u53d6host\u6216\u8005domain\u540e\u901a\u8fc7DNS\u83b7\u53d6\u5176IP\uff0c\u7136\u540e\u548c\u5185\u7f51\u5730\u5740\u8fdb\u884c\u6bd4\u8f83\u3002<\/p>\n
\u5bf9\u5df2\u6821\u9a8c\u901a\u8fc7\u5730\u5740\u8fdb\u884c\u8bbf\u95ee\u65f6\uff0c\u5e94\u5173\u95ed\u8ddf\u8fdb\u8df3\u8f6c\u529f\u80fd\u3002<\/p>\n
\u53c2\u8003\u793a\u4f8b\uff1a<\/p>\n
     httpConnection = (HttpURLConnection) Url.openConnection();\n\n     httpConnection.setFollowRedirects(false);<\/code><\/pre>\n
<\/a><\/p>\n
1.4 XML\u8bfb\u5199<\/h4>\n
1.4.1\u3010\u5fc5\u987b\u3011XML\u89e3\u6790\u5668\u5173\u95edDTD\u89e3\u6790<\/h5>\n
\u8bfb\u53d6\u5916\u90e8\u4f20\u5165XML\u6587\u4ef6\u65f6\uff0cXML\u89e3\u6790\u5668\u521d\u59cb\u5316\u8fc7\u7a0b\u4e2d\u8bbe\u7f6e\u5173\u95edDTD\u89e3\u6790\u3002<\/p>\n
\u53c2\u8003\u793a\u4f8b\uff1a<\/p>\n
javax.xml.parsers.DocumentBuilderFactory<\/p>\n
DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();\ntry {\n    dbf.setFeature("http:\/\/apache.org\/xml\/features\/disallow-doctype-decl", true);\n    dbf.setFeature("http:\/\/xml.org\/sax\/features\/external-general-entities", false);\n    dbf.setFeature("http:\/\/xml.org\/sax\/features\/external-parameter-entities", false);\n    dbf.setFeature("http:\/\/apache.org\/xml\/features\/nonvalidating\/load-external-dtd", false);\n    dbf.setXIncludeAware(false);\n    dbf.setExpandEntityReferences(false);\n    \u2026\u2026\n}<\/code><\/pre>\n
org.dom4j.io.SAXReader<\/p>\n
saxReader.setFeature("http:\/\/apache.org\/xml\/features\/disallow-doctype-decl", true);\nsaxReader.setFeature("http:\/\/xml.org\/sax\/features\/external-general-entities", false);\nsaxReader.setFeature("http:\/\/xml.org\/sax\/features\/external-parameter-entities", false);<\/code><\/pre>\n
org.jdom2.input.SAXBuilder<\/p>\n
SAXBuilder builder = new SAXBuilder();\nbuilder.setFeature("http:\/\/apache.org\/xml\/features\/disallow-doctype-decl",true);\nbuilder.setFeature("http:\/\/xml.org\/sax\/features\/external-general-entities", false);\nbuilder.setFeature("http:\/\/xml.org\/sax\/features\/external-parameter-entities", false);\nDocument doc = builder.build(new File(fileName));<\/code><\/pre>\n
org.xml.sax.XMLReader<\/p>\n
XMLReader reader = XMLReaderFactory.createXMLReader();\nreader.setFeature("http:\/\/apache.org\/xml\/features\/disallow-doctype-decl", true);\nreader.setFeature("http:\/\/apache.org\/xml\/features\/nonvalidating\/load-external-dtd", false);\nreader.setFeature("http:\/\/xml.org\/sax\/features\/external-general-entities", false);\nreader.setFeature("http:\/\/xml.org\/sax\/features\/external-parameter-entities", false);<\/code><\/pre>\n
<\/a><\/p>\n
1.5 \u54cd\u5e94\u8f93\u51fa<\/h4>\n
1.5.1\u3010\u5fc5\u987b\u3011\u8bbe\u7f6e\u6b63\u786e\u7684HTTP\u54cd\u5e94\u5305\u7c7b\u578b<\/h5>\n
\u54cd\u5e94\u5305\u7684HTTP\u5934\u201cContent-Type\u201d\u5fc5\u987b\u6b63\u786e\u914d\u7f6e\u54cd\u5e94\u5305\u7684\u7c7b\u578b\uff0c\u7981\u6b62\u975eHTML\u7c7b\u578b\u7684\u54cd\u5e94\u5305\u8bbe\u7f6e\u4e3a\u201ctext\/html\u201d\u3002\u6b64\u4e3e\u4f1a\u4f7f\u6d4f\u89c8\u5668\u5728\u76f4\u63a5\u8bbf\u95ee\u94fe\u63a5\u65f6\uff0c\u5c06\u975eHTML\u683c\u5f0f\u7684\u8fd4\u56de\u62a5\u6587\u5f53\u505aHTML\u89e3\u6790\uff0c\u589e\u52a0\u53cd\u5c04\u578bXSS\u7684\u89e6\u53d1\u51e0\u7387\u3002<\/p>\n
1.5.2\u3010\u5efa\u8bae\u3011\u8bbe\u7f6e\u5b89\u5168\u7684HTTP\u54cd\u5e94\u5934<\/h5>\n