10 处理乱码
10.1 乱码问题
- 编写一个控制器
@Controller
public class EncodingController {
@RequestMapping("/ec/t")
public String tester(@RequestParam("name")String name, Model model){
model.addAttribute("msg",name);
return "e";
}
}
- 编写相应的jsp
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
<title>Title</title>
</head>
<body>
<h1>${msg}</h1>
</body>
</html>
- 编写index.jsp主页面
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
<title>$Title$</title>
</head>
<body>
<form action="/ec/t" method="post">
<input type="text" name="name">
<input type="submit" value="提交"/>
</form>
</body>
</html>
- 测试
可以看到页面跳转了，但却乱码了
这在post方式上常见，在get方式上却少见
解决乱码的问题我们可以使用过滤器，一种是自定义过滤器，一种是使用SpringMVC提供的过滤器
10.2 自定义过滤器
- 自定义一个过滤器
EncodingFilter，实现Filter
package com.cap.filter;
import javax.servlet.*;
import java.io.IOException;
public class EncodingFilter implements Filter {
@Override
public void init(FilterConfig filterConfig) throws ServletException {
}
@Override
public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
servletRequest.setCharacterEncoding("UTF-8");
servletResponse.setCharacterEncoding("UTF-8");
filterChain.doFilter(servletRequest, servletResponse);
}
@Override
public void destroy() {
}
}
- 在web.xml注册在过滤器
<filter>
<filter-name>encoding</filter-name>
<filter-class>com.cap.filter.EncodingFilter</filter-class>
</filter>
<filter-mapping>
<filter-name>encoding</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
- 测试
10.3 SpringMVC提供的过滤器
- 直接在web.xml上使用SpringMVC提供的过滤器
<filter>
<filter-name>encodingFilter</filter-name>
<filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class>
<init-param>
<param-name>encoding</param-name>
<param-value>utf-8</param-value>
</init-param>
</filter>
<filter-mapping>
<filter-name>encodingFilter</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
- 结果可得：
