SpringBoot框架下设置字符编码

1. 第一种方式： CharacterEncodingFilter

1.1 创建Servlet类

src/main/java/com/guo/springboot/servlet/MyServlet.java

package com.guo.springboot.servlet;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

@WebServlet(urlPatterns = "/myservlet")     
public class MyServlet extends HttpServlet {
    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        resp.getWriter().println("世界你好！ 点赞点赞 Hello World!");
        resp.setContentType("text/html;character=utf-8");
        //统一设置浏览器编码
        resp.getWriter().flush();
        resp.getWriter().close();
    }

    @Override
    protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        doGet(req,resp);
    }
}

1.2 创建配置类：CharacterEncodingFilter

src/main/java/com/guo/springboot/config/SystemConfig.java

package com.guo.springboot.config;

import org.springframework.boot.web.servlet.FilterRegistrationBean;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.filter.CharacterEncodingFilter;

@Configuration   //声明此类为配置类
public class SystemConfig {
    @Bean
    public FilterRegistrationBean myFilterRegistrationBean(){
        //创建字符编码过滤器
        CharacterEncodingFilter characterEncodingFilter=new CharacterEncodingFilter();
        //设置强制使用指定字符编码
        characterEncodingFilter.setForceEncoding(true);
        //设置指定字符编码
        characterEncodingFilter.setEncoding("utf-8");

        FilterRegistrationBean filterRegistrationBean=new FilterRegistrationBean();
        //设置字符编码过滤器
        filterRegistrationBean.setFilter(characterEncodingFilter);
        //设置字符编码过滤器路径
        filterRegistrationBean.addUrlPatterns("/*");
        return filterRegistrationBean;
    }
}

1.3 核心配置文件

src/main/resources/application.properties

#关闭SpringBoot的HTTP字符编码支持
#只有关闭该选项后，spring字符编码过滤器才能生效
server.servlet.encoding.enabled=false

1.4 程序入口类——开启包扫描

src/main/java/com/guo/springboot/Application.java

package com.guo.springboot;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.web.servlet.ServletComponentScan;

@SpringBootApplication
@ServletComponentScan(basePackages = "com.guo.springboot.servlet")
public class Application {
    public static void main(String[] args) {
        SpringApplication.run(Application.class, args);
    }
}

1.5 启动看结果

2. 第二种方式：SpringBoot字符编码（推荐）

2.1 创建Servlet类

src/main/java/com/guo/springboot/servlet/MyServlet.java

package com.guo.springboot.servlet;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
@WebServlet(urlPatterns = "/myservlet")
public class MyServlet extends HttpServlet {
    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        resp.getWriter().println("世界你好！ 点点赞 Hello World!");
        resp.setContentType("text/html;character=utf-8");
        //统一设置浏览器编码
        resp.getWriter().flush();
        resp.getWriter().close();
    }
    @Override
    protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        doGet(req,resp);
    }
}

2.2 核心配置文件

src/main/resources/application.properties

#设置请求响应字符编码
#即使我们配置文件中不配置server.servlet.encoding.enabled=true，也是默认生效的。
#让系统的CharacterEncdoingFilter生效
server.servlet.encoding.enabled=true
#强制request，response都使用charset属性的值
server.servlet.encoding.force=true
#server.servlet.encoding.charset=utf-8

之前的方法过时了，Alt+Enter自定提示转换新版的

2.3 程序入口类——开启包扫描

src/main/java/com/guo/springboot/Application.java

package com.guo.springboot;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.web.servlet.ServletComponentScan;
@SpringBootApplication
@ServletComponentScan(basePackages = "com.guo.springboot.servlet")
public class Application {
    public static void main(String[] args) {
        SpringApplication.run(Application.class, args);
    }
}

2.4 启动看结果

两种方式都能达到相同的效果，显然第二种方式更为简单，方便。