springmvc-servlet.xml
<bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver"> <!-- 必须和用户JSP 的pageEncoding属性一致，以便正确解析表单的内容 --> <property name="defaultEncoding" value="UTF-8"></property> <!-- 文件最大大小(字节) 1024*1024*50=50M--> <property name="maxUploadSize" value="52428800"></property> <!--resolveLazily属性启用是为了推迟文件解析，以便捕获文件大小异常--> <property name="resolveLazily" value="true"/> </bean>upload.jsp
<%-- Created by IntelliJ IDEA. User: Admin Date: 2019/9/29 Time: 20:28 To change this template use File | Settings | File Templates. --%> <%@ page contentType="text/html;charset=UTF-8" language="java" %> <html> <head> <title>文件上传</title> </head> <body> <form action="${pageContext.request.contextPath}/upload" method="post" enctype="multipart/form-data"> 上传文件：<input type="file" name="img" > <button type="submit">提交</button> </form> </body> </html>HelloController
package com.lin.controller; import com.lin.service.BookService; import com.lin.util.JSONResult; import org.apache.commons.io.FileUtils; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.stereotype.Controller; import org.springframework.web.bind.annotation.RequestMapping; import org.springframework.web.bind.annotation.ResponseBody; import org.springframework.web.multipart.MultipartFile; import javax.servlet.http.HttpServletRequest; import java.io.File; import java.io.IOException; import java.util.List; import java.util.Map; /** * 五种返回形式 * 1，转发到jsp界面 * 2, 转发到Action界面 * 3, 重定向到jsp界面 * 4, 重定向到Action界面 * 5, * */ @RequestMapping("/hello") @Controller public class HelloController { @Autowired private BookService bookService; /** * 重定向到jsp界面 * @param request * @return */ @RequestMapping("/hello3") public String hello3(HttpServletRequest request){ request.setAttribute("msg","调用了重定向方法到jsp页面"); return "redirect:/hello.jsp"; } @RequestMapping("/upload") public String upload(HttpServletRequest request, MultipartFile img){ try { FileUtils.copyInputStreamToFile(img.getInputStream(),new File("D://temp//"+img.getOriginalFilename())); } catch (IOException e) { e.printStackTrace(); } return "redirect:hello3"; } }JSONResult.java
package com.lin.util; public class JSONResult { // 响应业务状态 private Integer status; // 响应消息 private String msg; // 响应中的数据 private Object data; private String ok; // 不使用 public static JSONResult build(Integer status, String msg, Object data) { return new JSONResult(status, msg, data); } public static JSONResult ok(Object data) { return new JSONResult(data); } public static JSONResult ok() { return new JSONResult(null); } public static JSONResult errorMsg(String msg) { return new JSONResult(500, msg, null); } public static JSONResult errorMap(Object data) { return new JSONResult(501, "error", data); } public static JSONResult errorTokenMsg(String msg) { return new JSONResult(502, msg, null); } public static JSONResult errorException(String msg) { return new JSONResult(555, msg, null); } public JSONResult() { } public JSONResult(Integer status, String msg, Object data) { this.status = status; this.msg = msg; this.data = data; } public JSONResult(Object data) { this.status = 200; this.msg = "OK"; this.data = data; } public Boolean isOK() { return this.status == 200; } public Integer getStatus() { return status; } public void setStatus(Integer status) { this.status = status; } public String getMsg() { return msg; } public void setMsg(String msg) { this.msg = msg; } public Object getData() { return data; } public void setData(Object data) { this.data = data; } public String getOk() { return ok; } public void setOk(String ok) { this.ok = ok; } }调用类JSONResult在方法上面加上@ResponseBody这个注解就好了
package com.liwangwang.controller; import com.liwangwang.service.BookService; import com.liwangwang.util.JSONResult; import org.apache.commons.io.FileUtils; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.stereotype.Controller; import org.springframework.web.bind.annotation.RequestMapping; import org.springframework.web.bind.annotation.ResponseBody; import org.springframework.web.multipart.MultipartFile; import javax.servlet.http.HttpServletRequest; import java.io.File; import java.io.IOException; import java.util.List; import java.util.Map; /** * @author liwangwang * @site www.liwangwang.com * @company * @create 2019-09-28 11:10 */ @RequestMapping("/hello") @Controller public class HelloController { @ResponseBody @RequestMapping("/listpager1") public List<Map> listpager1(){ return bookservice.listPager(new Book(),new PageBean()); } @ResponseBody @RequestMapping("/listpager2") public JSONResult listpager2(){ return bookservice.listPager(new Book(),new PageBean()).get(0); } @ResponseBody @RequestMapping("/jsonData3") public JSONResult jsonData3(){ Map map = new HashMap(); return JSONResult.ok("成功：这里可以存放字符串、对象、数组、集合都行，这样可以节省拼接map集合的过程"); } @ResponseBody @RequestMapping("/jsonData4") public JSONResult jsonData4(){ return JSONResult.errorMsg("失败：这里可以存放字符串、对象、数组、集合都行，这样可以节省拼接map集合的过程"); } }
