springboot2.0整合同時支援jsp+html跳轉的方法介紹（附程式碼）

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說明一下 。整合會遇到的問題，

1、pom.xml檔案同時放入thymeleaf 架包和jsp支援後，  springboot的return模版會預設跳到html  ，

那怕是你並沒有配置thymeleaf的屬性

解決方案，  使用getRequestDispatcher方法來跳到jsp頁面， 就同時支援html和jsp了 

request.getRequestDispatcher("/WEB-INF/views /testJsp.jsp").forward(request, response);

2、另外使用getRequestDispatcher跳到html頁面的時候，thymeleaf 模版接收參數可能會出現問題。

解決方案1：html放棄使用thymeleaf 模版，然後在頁面主動請求接口資料(AJAX POST等)

解決方案2：html繼續使用thymeleaf 模版，用return模版返回來跳轉頁面

代码
 UserController.java

package com.example.demo.controller;

import com.example.demo.service.UserService;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.ResponseBody;

import javax.annotation.Resource;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

/**
 * @author chenlin
 */
@Controller
@RequestMapping("/usersDemo")
public class UserController {
    private static Logger log = LoggerFactory.getLogger(UserController.class);
    @Resource
    UserService userService;

    @ResponseBody
    @RequestMapping(value = "/test", produces = "application/json;charset=UTF-8", method = {RequestMethod.POST, RequestMethod.GET})
    public List> test(){
        log.info("进入了test方法！");
        List> list=userService.userQueryAll();
        return list;
    }
    @RequestMapping(value = "/testHtml", produces = "application/json;charset=UTF-8", method = {RequestMethod.POST, RequestMethod.GET})
    public String testHtml(HttpServletRequest request, HttpServletResponse response){
        List> list=userService.userQueryAll();
        request.setAttribute("list",list);
        log.info("进入了testHtml方法！");
        return "views/testHtml";
    }
    @RequestMapping(value = "/testJsp", produces = "application/json;charset=UTF-8", method = {RequestMethod.POST, RequestMethod.GET})
    public void testJsp( HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        List> list=userService.userQueryAll();
        request.setAttribute("list",list);
        log.info("进入了testJsp方法！");
        request.getRequestDispatcher("/WEB-INF/views/testJsp.jsp").forward(request, response);
    }
}

設定檔

server:
  port: 8080
  tomcat:
    uri-encoding: UTF-8
  servlet:
    context-path: /
spring:
  dataSource:
    type: com.alibaba.druid.pool.DruidDataSource
    url: jdbc:mysql://localhost:3306/db-test?useUnicode=true&characterEncoding=utf8&tinyInt1isBit=false&usessl=false
    username: root
    password: 123456
    driverClassName: com.mysql.jdbc.Driver
  mvc:
    view: #新版本 1.3后可以使用
      suffix: .jsp
      prefix: /WEB-INF/
  view: #老版本 1.4后被抛弃
    suffix: .jsp
    prefix: /WEB-INF/
  thymeleaf:
    #清除缓存
    cache: false
    mode: LEGACYHTML5 #非严格模式
    prefix: /WEB-INF/ #默认 classpath:/templates/
    suffix: .html
    servlet:
      content-type: text/html
mybatis:
  mapper-locations: classpath:com/example/demo/mapper/*Mapper.xml #注意：一定要对应mapper映射xml文件的所在路径
  type-aliases-package: com.example.demo.model # 注意：对应实体类的路径
  configuration:
    call-setters-on-nulls: true # 解决使用map类型接收查询结果的时候为null的字段会没有的情况

pom.xml

    4.0.0
    
        org.springframework.boot
        spring-boot-starter-parent
        2.0.8.RELEASE
         
    
    com.example
    demo
    0.0.1-SNAPSHOT
    demo
    Demo project for Spring Boot

    
        1.8
        5.1.47
    

    
        
            org.springframework.boot
            spring-boot-starter-jdbc
        
        
            org.springframework.boot
            spring-boot-starter-web
        
        
            org.mybatis.spring.boot
            mybatis-spring-boot-starter
            2.0.0
        
        
            org.springframework.boot
            spring-boot-starter-test
            test
        
        
        
            com.alibaba
            druid-spring-boot-starter
            1.1.13
        
        
            mysql
            mysql-connector-java
            ${mysql.version}
        
        
        
            org.springframework.boot
            spring-boot-starter-thymeleaf
        
        
        
            net.sourceforge.nekohtml
            nekohtml
            1.9.22
        
        
        
            org.springframework.boot
            spring-boot-starter-tomcat
            provided
        
        
            org.apache.tomcat.embed
            tomcat-embed-jasper
            provided
        
        
        
            javax.servlet
            javax.servlet-api
            4.0.1
            provided
        
        
        
            javax.servlet
            jstl
        
    

    
        
            
            
                src/main/java
                
                    **/*.xml
                
                false
            
            
                
                src/main/webapp
                META-INF/resources
                
                    **/**
                
            
        
    

以上就完成了。

另外附加一個return 模版的java程式碼配置， 可以配置return模版的優先權，後面的檔案格式，當然只能用getRequestDispatcher來跳轉了 

在啟動類別中新增，另外，設定檔參數和程式碼可重複   但是程式碼優先於設定檔。 

/**
 * 添加对jsp支持
 * 
 */
@Bean
public ViewResolver getJspViewResolver() {
    InternalResourceViewResolver internalResourceViewResolver = new InternalResourceViewResolver();
    internalResourceViewResolver.setPrefix("/WEB-INF/");//前缀
    internalResourceViewResolver.setSuffix(".jsp");//后缀
    internalResourceViewResolver.setOrder(0);//优先级
    return internalResourceViewResolver;
}

/**
 * 添加对Freemarker支持
 *
 */
@Bean
public FreeMarkerViewResolver getFreeMarkerViewResolver() {
    FreeMarkerViewResolver freeMarkerViewResolver = new FreeMarkerViewResolver();
    freeMarkerViewResolver.setCache(false);
    freeMarkerViewResolver.setPrefix("/WEB-INF/");//前缀
    freeMarkerViewResolver.setSuffix(".html");//后缀
    freeMarkerViewResolver.setRequestContextAttribute("request");
    freeMarkerViewResolver.setOrder(1);//优先级
    freeMarkerViewResolver.setContentType("text/html;charset=UTF-8");
    return freeMarkerViewResolver;

}

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