出現(xiàn)亂碼一般都是post居多

解決post get 請求亂碼

在 Tomcat 為 URIEncoding="utf-8" 前提下，為啥post 字符串的格式還是 ISO-8859-1 ?

方式一：SpringMVC過濾器

據(jù)說：極端情況下.這個過濾器對get的支持不好(鄙人沒發(fā)現(xiàn)茎毁，這個就挺好)

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

springmvc.png

方式二：更改Tomcat 編碼配置 URIEncoding="utf-8"

我咋覺著沒啥用呢(實測沒啥用，改了兼容性好秸妥。沒有問題不改也行)
配置文件路徑：apache-tomcat-8.5.72/conf/server.xml

<Connector port="8080" protocol="HTTP/1.1" URIEncoding="utf-8"
               connectionTimeout="20000"
               redirectPort="8443" relaxedPathChars="|{}[],%" relaxedQueryChars="|{}[],%" />

tomcat-config.png

方式三：抄大神作業(yè)

springmvc 不好用就試試這個。

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 {
    @Override
    public void init(FilterConfig filterConfig) throws ServletException {
    }

    @Override
    public void destroy() {
    }

    @Override
    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);
    }


}

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

    private HttpServletRequest request;

    // 是否編碼
    private boolean hasEncode;

    // 定義一個可以傳入 入HttpServletRequest對象的構(gòu)造函數(shù)筛峭，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
    @Override
    public Map<String, String[]> 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++) {

                            String targetStr = values[I];
                            String encode = "ISO-8859-1";
                            try {
                                //  "ISO-8859-1" 轉(zhuǎn)為 utf-8
                                if (targetStr.equals(new String(targetStr.getBytes(encode), encode))) {
                                    try {
                                        // 處理get亂碼
                                        values[i] = new String(values[i].getBytes(encode), "utf-8");
                                    } catch (UnsupportedEncodingException e) {
                                        e.printStackTrace();
                                    }
                                }
                            } catch (final UnsupportedEncodingException e) {
                                e.printStackTrace();
                            }
                        }
                    }
                }
                hasEncode = true;
            }
            return parameterMap;
        }
        return super.getParameterMap();
    }

    @Override
    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
    }

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

copy.png

處理請求返回json字符串的中文亂碼問題

方式一、通過spring 配置一次性解決亂碼

<mvc:annotation-driven>
      <mvc:message-converters register-defaults="true">
         <!-- StringHttpMessageConverter編碼為UTF-8陪每，防止亂碼 -->
         <bean class="org.springframework.http.converter.StringHttpMessageConverter">
            <constructor-arg value="UTF-8" />
         </bean>
         <bean class="org.springframework.http.converter.json.MappingJackson2HttpMessageConverter">
            <property name="objectMapper">
               <bean class="org.springframework.http.converter.json.Jackson2ObjectMapperFactoryBean">
                  <property name="failOnEmptyBeans" value="false"/>
               </bean>
            </property>
         </bean>
      </mvc:message-converters>
   </mvc:annotation-driven>

方式二影晓、produces:指定響應(yīng)體返回類型和編碼

@RequestMapping(value = "/json1",produces = "application/json;charset=utf-8")

json1.png