文件上传和下载[springmvc]

一. 文件上传

index.jsp

<!-- 文件上传 -->
    <form action="testHttpMessageConverter" method="post" enctype="multipart/form-data">
        File: <input type="file" name="file"/>
        Desc: <input type="text" name="desc"/>
        <input type="submit" value="Submit"/>
    </form>

EmployeeHandler.java

@Controller
public class EmployeeHandler {
    
    /**
     * 不加这个会跳转到Hello World + new DAte().jsp对应的页面, 而没有页面和这个对应
     * 加上会直接在客户端返回Hello World + new DAte()
     */
    @ResponseBody    
    @RequestMapping("/testHttpMessageConverter")
    public String testFileUp(@RequestBody String body) {
        System.out.println(body);
        return "Hello World " + new Date();
    }
}

运行:

后台打印:

 

 

二. 文件下载

准备下载的文件:

 index.jsp

<!-- 文件下载 -->
    <form action="testResponseEntity" method="post" enctype="multipart/form-data">
        File: <input type="file" name="file"/>
        Desc: <input type="text" name="desc"/>
        <input type="submit" value="Submit"/>
    </form>

EmployeeHandler.java

@Controller
public class EmployeeHandler {
    
    @RequestMapping("/testResponseEntity")
    public ResponseEntity<byte[]> testResponseEntity(HttpSession session) throws IOException {
        byte []body = null;
        ServletContext servletContext = session.getServletContext();
        InputStream in = servletContext.getResourceAsStream("/files/abc.txt");
        body = new byte[in.available()];
        in.read(body);
        
        HttpHeaders headers = new HttpHeaders();
        headers.add("Content-Disposition", "atachment;filename=abc.txt");
        
        HttpStatus statusCode = HttpStatus.OK;
        
        ResponseEntity<byte[]> response = new ResponseEntity<byte[]>(body, headers, statusCode);
        return response;
    }
}

 运行: