java - 多部分/表单数据 Restful 请求

Question

我正在处理按边界划分的 multipart/form-data POST 请求。

POST .... HTTP/1.1
.
.
.
---boundary123
Content-type:application/octet-stream
content-Disposition: form-data filenale="payload.txt" name="someuniquename"
[paylaod content](this is in xml format)
---boundary123
content-type:application/json
content-Disposition:form-data name="someuniquname"
{ID:"999"}
---boundary123

我该如何处理这个多部分请求？我还想在使用 Spring4 和 REST 发出 POST 请求之前验证数据。

Answer 1

您应该遵循以下代码:

import java.io.BufferedOutputStream;
import java.io.File;
import java.io.FileOutputStream;
import org.springframework.stereotype.Controller;
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 org.springframework.web.multipart.MultipartFile;
@Controller
public class FileUploadController {
    @RequestMapping(value="/singleUpload")
    public String singleUpload(){
        return "singleUpload";
    }
    @RequestMapping(value="/singleSave", method=RequestMethod.POST )
    public @ResponseBody String singleSave(@RequestParam("file") MultipartFile file, @RequestParam("desc") String desc ){
        System.out.println("File Description:"+desc);
        String fileName = null;
        if (!file.isEmpty()) {
            try {
                fileName = file.getOriginalFilename();
                byte[] bytes = file.getBytes();
                BufferedOutputStream buffStream = 
                        new BufferedOutputStream(new FileOutputStream(new File("F:/cp/" + fileName)));
                buffStream.write(bytes);
                buffStream.close();
                return "You have successfully uploaded " + fileName;
            } catch (Exception e) {
                return "You failed to upload " + fileName + ": " + e.getMessage();
            }
        } else {
            return "Unable to upload. File is empty.";
        }
    }
    @RequestMapping(value="/multipleUpload")
    public String multiUpload(){
        return "multipleUpload";
    }
    @RequestMapping(value="/multipleSave", method=RequestMethod.POST )
    public @ResponseBody String multipleSave(@RequestParam("file") MultipartFile[] files){
        String fileName = null;
        String msg = "";
        if (files != null && files.length >0) {
            for(int i =0 ;i< files.length; i++){
                try {
                    fileName = files[i].getOriginalFilename();
                    byte[] bytes = files[i].getBytes();
                    BufferedOutputStream buffStream = 
                            new BufferedOutputStream(new FileOutputStream(new File("F:/cp/" + fileName)));
                    buffStream.write(bytes);
                    buffStream.close();
                    msg += "You have successfully uploaded " + fileName +"<br/>";
                } catch (Exception e) {
                    return "You failed to upload " + fileName + ": " + e.getMessage() +"<br/>";
                }
            }
            return msg;
        } else {
            return "Unable to upload. File is empty.";
        }
    }
}