解决get和post请求提交数据中文乱码问题

系统管理员 2022-04-02 07:40 273阅读 0赞

**目录**

get请求乱码

乱码案例

解决办法

方法一：进行转码

方法二：修改tomcat中conf/server.xml

post请求乱码

解决办法：在取参数之前设置编码格式

--------------------

# get请求乱码 #

**Tomcat8以后不需要处理GET请求，默认是UTF-8编码！！！**

## 乱码案例 ##

一个简单的登录共能，将表单中的账号密码提交给Servlet

<!DOCTYPE html>
    <html>
    <head>
    	<meta charset="UTF-8">
    	<title>Insert title here</title>
    </head>
    <body>
    	<h2>请输入账号密码登录</h2>
    	<form action="LoginServlet" method="get">
    		账号：<input type="text" name="username"><br>
    		密码：<input type="text" name="password"><br>
    		<input type="submit" value="登录">
    	</form>
    </body>
    </html>

提交给的Servlet

package com.zhujunwei.demo;
    
    import java.io.IOException;
    
    import javax.servlet.ServletException;
    import javax.servlet.http.HttpServlet;
    import javax.servlet.http.HttpServletRequest;
    import javax.servlet.http.HttpServletResponse;
    
    public class LoginServlet extends HttpServlet
    {
    	private static final long serialVersionUID = 1L;
    
    	@Override
    	protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
    		//取得用户名和密码
    		String username = req.getParameter("username");
    		String password = req.getParameter("password");
    		System.out.println("username="+username);
    		System.out.println("password="+password);
    	}
    	
    	@Override
    	protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
    		doGet(req, resp);
    	}
    }

Servlet取得用户名和密码并将他们打印在控制台。

结果

只有英文，控制台得到信息

username=admin
    password=123456

用户名在出项中文时会出现乱码。

## 解决办法 ##

### 方法一：进行转码 ###

//取得用户名和密码
    String username = req.getParameter("username");
    String password = req.getParameter("password");
    //进行转码
    username = new String(username.getBytes("ISO-8859-1"),"UTF-8");
    System.out.println("username="+username);
    System.out.println("password="+password);

### 方法二：修改tomcat中conf/server.xml ###

找到

Connector connectionTimeout="20000" port="8080" protocol="HTTP/1.1" redirectPort="8443"/>

修改为

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

# post请求乱码 #

## 解决办法：在取参数之前设置编码格式 ##

// 取得用户名和密码
    //解决post请求乱码
    req.setCharacterEncoding("UTF-8");
    String username = req.getParameter("username");
    String password = req.getParameter("password");
    System.out.println("username=" + username);
    System.out.println("password=" + password);