Common methods and techniques for solving Tomcat garbled problems

Common methods and techniques to solve Tomcat garbled problem, specific code examples are required

1. Introduction
Tomcat is a widely used Java Web server. When processing requests and responses, you sometimes encounter problems with Chinese garbled characters. This article will introduce some common methods and techniques to solve Tomcat garbled problems, and provide specific code examples.

2. Set Tomcat’s character encoding

1. Modify the server.xml file
   Open Tomcat’s server.xml configuration file, find the Connector node, and add the attribute URIEncoding ="UTF-8", the example is as follows:

   <Connector port="8080" protocol="HTTP/1.1"
           connectionTimeout="20000"
           redirectPort="8443"
           URIEncoding="UTF-8" />

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2. Modify the web.xml file
   Find the web.xml file in the WEB-INF folder of the web application and add the following code :

   <filter>
    <filter-name>encodingFilter</filter-name>
    <filter-class>org.apache.catalina.filters.SetCharacterEncodingFilter</filter-class>
    <init-param>
        <param-name>encoding</param-name>
        <param-value>UTF-8</param-value>
    </init-param>
   
    <!-- 设为true表示强制将请求、响应的编码都设置为UTF-8 -->
    <init-param>
        <param-name>forceEncoding</param-name>
        <param-value>true</param-value>
    </init-param>
   </filter>
   <filter-mapping>
    <filter-name>encodingFilter</filter-name>
    <url-pattern>/*</url-pattern>
   </filter-mapping>

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   This code will set the character encoding of the request and response to UTF-8 through the filter.

3. Set the character encoding of the JSP page
In the JSP page, you can set the character encoding through instructions. The sample code is as follows:

<%@ page language="java" contentType="text/html; charset=UTF-8"
         pageEncoding="UTF-8"%>

This code will The page's character encoding is set to UTF-8.

4. Set the default character encoding of Tomcat

1. Modify the catalina.properties file
   Open the conf folder in the Tomcat installation directory and find the catalina.properties file. Add the following code at the end of the file:

   file.encoding=UTF-8

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   This code will set Tomcat's default character encoding to UTF-8.

2. Modify the startup.bat file (only applicable to Windows systems)
   Open the bin folder in the Tomcat installation directory, find the startup.bat file, and add the following code at the beginning of the file:

   set JAVA_OPTS=%JAVA_OPTS% -Dfile.encoding=UTF-8

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   This code will set the default character encoding of the Java virtual machine started by Tomcat to UTF-8.

The above are common methods and techniques to solve Tomcat garbled problem. Now let’s look at some specific code examples.

5. Code example

1. Use ServletResponse to set the character encoding of the response:

   response.setCharacterEncoding("UTF-8");
   response.getWriter().write("中文乱码问题已解决！");

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2. When using ServletRequest to obtain the request parameters Character encoding settings:

   request.setCharacterEncoding("UTF-8");
   String username = request.getParameter("username");

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3. Character encoding settings when using InputStreamReader to read request parameters:

   InputStream inputStream = request.getInputStream();
   BufferedReader reader = new BufferedReader(new InputStreamReader(inputStream, "UTF-8"));
   String line;
   while ((line = reader.readLine()) != null) {
    // 处理请求参数
   }

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6. Summary
Solve Tomcat Common methods and techniques for garbled code problems include: setting the character encoding of Tomcat, setting the character encoding of the JSP page, and setting the default character encoding of Tomcat. In actual development, selection and configuration can be made according to specific needs and environments. Through the methods and code examples introduced in this article, I believe readers can solve the problem of Tomcat garbled characters and effectively handle Chinese characters during development. Hope this article is helpful to readers!

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