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SpringMVC出現(xiàn)中文亂碼的情況及三種解決方法

猿友 2021-08-03 17:26:37 瀏覽數(shù) (4823)
反饋

背景

舉個例子，出現(xiàn)中文亂碼的例子：提交表單的時候。

表單

<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
    <title>Title</title>
</head>
<body>
<form action="/c02/t1" method="post">
    <input type="text" name="name">
    <input type="submit">
</form>
</body>
</html>

業(yè)務(wù)控制類

package controller;

import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.RequestMapping;

@Controller
public class controllerDemo02 {

    @RequestMapping("/c02/t1")
    public String test1(String name, Model model){
        System.out.println(name);
        model.addAttribute("message",name);
        return "test";
    }
}

結(jié)果：出現(xiàn)亂碼

2021415141158102

解決方案

使用自己寫的過濾器

自定義一個Filter過濾器，去過濾亂碼

package Filter;

import javax.servlet.*;
import java.io.IOException;

public class EncodingFilter implements Filter {
    public void init(FilterConfig filterConfig) throws ServletException {

    }

    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        servletRequest.setCharacterEncoding("utf-8");
        servletResponse.setCharacterEncoding("utf-8");
        filterChain.doFilter(servletRequest,servletResponse);
    }

    public void destroy() {

    }
}

在web.xml中配置這個過濾器

    <filter>
        <filter-name>EncodingFilter</filter-name>
        <filter-class>Filter.EncodingFilter</filter-class>
    </filter>
    <filter-mapping>
        <filter-name>EncodingFilter</filter-name>
        <url-pattern>/*</url-pattern>
    </filter-mapping>

使用SpringMVC提供的過濾器

直接在web.xml中配置（固定的）

<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>

如果上面兩種方法還實現(xiàn)不了，在試試以下這個方法，大神編寫的

package 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;

public class GenericEncodingFilter implements Filter {

    public void destroy() {
    }


    public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException {
        //處理response的字符編碼
        HttpServletResponse myResponse=(HttpServletResponse) response;
        myResponse.setContentType("text/html;charset=UTF-8");

        // 轉(zhuǎn)型為與協(xié)議相關(guān)對象
        HttpServletRequest httpServletRequest = (HttpServletRequest) request;
        // 對request包裝增強
        HttpServletRequest myrequest = new MyRequest(httpServletRequest);
        chain.doFilter(myrequest, response);
    }


    public void init(FilterConfig filterConfig) throws ServletException {
    }

}

//自定義request對象，HttpServletRequest的包裝類
class MyRequest extends HttpServletRequestWrapper {

    private HttpServletRequest request;
    //是否編碼的標記
    private boolean hasEncode;
    //定義一個可以傳入HttpServletRequest對象的構(gòu)造函數(shù)，以便對其進行裝飾
    public MyRequest(HttpServletRequest request) {
        super(request);// super必須寫
        this.request = request;
    }

    // 對需要增強方法 進行覆蓋

    public Map getParameterMap() {
        // 先獲得請求方式
        String method = request.getMethod();
        if (method.equalsIgnoreCase("post")) {
            // post請求
            try {
                // 處理post亂碼
                request.setCharacterEncoding("utf-8");
                return request.getParameterMap();
            } catch (UnsupportedEncodingException e) {
                e.printStackTrace();
            }
        } else if (method.equalsIgnoreCase("get")) {
            // get請求
            Map<String, String[]> parameterMap = request.getParameterMap();
            if (!hasEncode) { // 確保get手動編碼邏輯只運行一次
                for (String parameterName : parameterMap.keySet()) {
                    String[] values = parameterMap.get(parameterName);
                    if (values != null) {
                        for (int i = 0; i < values.length; i++) {
                            try {
                                // 處理get亂碼
                                values[i] = new String(values[i]
                                        .getBytes("ISO-8859-1"), "utf-8");
                            } catch (UnsupportedEncodingException e) {
                                e.printStackTrace();
                            }
                        }
                    }
                }
                hasEncode = true;
            }
            return parameterMap;
        }
        return super.getParameterMap();
    }

    //取一個值

    public String getParameter(String name) {
        Map<String, String[]> parameterMap = getParameterMap();
        String[] values = parameterMap.get(name);
        if (values == null) {
            return null;
        }
        return values[0]; // 取回參數(shù)的第一個值
    }

    //取所有值

    public String[] getParameterValues(String name) {
        Map<String, String[]> parameterMap = getParameterMap();
        String[] values = parameterMap.get(name);
        return values;
    }
}
 

以上就是關(guān)于當使用 SpringMVC 的時候出現(xiàn)中文亂碼的三種解決方法的詳細內(nèi)容，想要了解更多關(guān)于 SpringMVC 其他方面的資料，可以搜索W3Cschool其它相關(guān)技術(shù)文章！也希望大家能夠多多關(guān)注和支持我們！

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