文章中文字乱码问题解决办法集合

乱码问题

测试步骤：

1、我们可以在首页编写一个提交的表单

<form action="/e/t" method="post"><input type="text" name="name"><input type="submit">
</form>

2、后台编写对应的处理类

@Controller
public class Encoding {@RequestMapping("/e/t")public String test(Model model,String name){model.addAttribute("msg",name); //获取表单提交的值return "test"; //跳转到test页面显示输入的值}
}

3、输入中文测试，发现乱码

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不得不说，乱码问题是在我们开发中十分常见的问题，也是让我们程序猿比较头大的问题！

以前乱码问题通过过滤器解决 , 而SpringMVC给我们提供了一个过滤器 , 可以在web.xml中配置 .

修改了xml文件需要重启服务器！

<filter><filter-name>encoding</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>encoding</filter-name><url-pattern>/*</url-pattern>
</filter-mapping>

但是我们发现 , 有些极端情况下.这个过滤器对get的支持不好 .

处理方法 :

1、修改tomcat配置文件：设置编码！

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

2、自定义过滤器

package com.kuang.filter;import javax.servlet.*;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletRequestWrapper;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.io.UnsupportedEncodingException;
import java.util.Map;/**
* 解决get和post请求 全部乱码的过滤器
*/
public class GenericEncodingFilter implements Filter {@Overridepublic void destroy() {}@Overridepublic void doFilter(ServletRequest request, ServletResponse response, FilterChainchain) throws IOException, ServletException {//处理response的字符编码HttpServletResponse myResponse=(HttpServletResponse) response;myResponse.setContentType("text/html;charset=UTF-8");// 转型为与协议相关对象HttpServletRequest httpServletRequest = (HttpServletRequest) request;// 对request包装增强HttpServletRequest myrequest = new MyRequest(httpServletRequest);chain.doFilter(myrequest, response);}@Overridepublic void init(FilterConfig filterConfig) throws ServletException {}}//自定义request对象，HttpServletRequest的包装类
class MyRequest extends HttpServletRequestWrapper {private HttpServletRequest request;//是否编码的标记private boolean hasEncode;//定义一个可以传入HttpServletRequest对象的构造函数，以便对其进行装饰public MyRequest(HttpServletRequest request) {super(request);// super必须写this.request = request;}// 对需要增强方法 进行覆盖@Overridepublic Map getParameterMap() {// 先获得请求方式String method = request.getMethod();if (method.equalsIgnoreCase("post")) {// post请求try {// 处理post乱码request.setCharacterEncoding("utf-8");return request.getParameterMap();} catch (UnsupportedEncodingException e) {e.printStackTrace();}} else if (method.equalsIgnoreCase("get")) {// get请求Map<String, String[]> parameterMap = request.getParameterMap();if (!hasEncode) { // 确保get手动编码逻辑只运行一次for (String parameterName : parameterMap.keySet()) {String[] values = parameterMap.get(parameterName);if (values != null) {for (int i = 0; i < values.length; i++) {try {// 处理get乱码values[i] = new String(values[i].getBytes("ISO-8859-1"), "utf-8");} catch (UnsupportedEncodingException e) {e.printStackTrace();}}}}hasEncode = true;}return parameterMap;}return super.getParameterMap();}//取一个值@Overridepublic String getParameter(String name) {Map<String, String[]> parameterMap = getParameterMap();String[] values = parameterMap.get(name);if (values == null) {return null;}return values[0]; // 取回参数的第一个值}//取所有值@Overridepublic String[] getParameterValues(String name) {Map<String, String[]> parameterMap = getParameterMap();String[] values = parameterMap.get(name);return values;}
}