本文实例为大家分享了java实现文件上传到服务器的具体代码，供大家参考，具体内容如下
1、运行jar包，发送post请求
public static void main(String[] args) {
//String filePath="C:/Users/706293/IT_onDuty.xls";
String filePath=args[0];
String unid=args[1];
// String unid="155555";
DataOutputStream out = null;
final String newLine = "\r\n";
final String prefix = "--";
try {
URL url = new URL("http://172.20.200.64:9000/excel9000/uploads");
HttpURLConnection conn = (HttpURLConnection)url.openConnection();
String BOUNDARY = "-------7da2e536604c8";
conn.setRequestMethod("POST");
// 发送POST请求必须设置如下两行
conn.setDoOutput(true);
conn.setDoInput(true);
conn.setUseCaches(false);
conn.setRequestProperty("connection", "Keep-Alive");
conn.setRequestProperty("Charsert", "UTF-8");
conn.setRequestProperty("Content-Type", "multipart/form-data; boundary=" + BOUNDARY);
out = new DataOutputStream(conn.getOutputStream());
// 添加参数file
File file = new File(filePath);
StringBuilder sb1 = new StringBuilder();
sb1.append(prefix);
sb1.append(BOUNDARY);
sb1.append(newLine);
sb1.append("Content-Disposition: form-data;name=\"file\";filename=\"" + file.getName() + "\"" + newLine);
sb1.append("Content-Type:application/octet-stream");
sb1.append(newLine);
sb1.append(newLine);
out.write(sb1.toString().getBytes());
DataInputStream in = new DataInputStream(new FileInputStream(file));
byte[] bufferOut = new byte[1024];
int bytes = 0;
while ((bytes = in.read(bufferOut)) != -1) {
out.write(bufferOut, 0, bytes);
}
out.write(newLine.getBytes());
in.close();
// 添加参数sysName
StringBuilder sb = new StringBuilder();
sb.append(prefix);
sb.append(BOUNDARY);
sb.append(newLine);
sb.append("Content-Disposition: form-data;name=\"unid\"");
sb.append(newLine);
sb.append(newLine);
sb.append(unid);
out.write(sb.toString().getBytes());
添加参数returnImage
//StringBuilder sb2 = new StringBuilder();
//sb2.append(newLine);
//sb2.append(prefix);
//sb2.append(BOUNDARY);
//sb2.append(newLine);
//sb2.append("Content-Disposition: form-data;name=\"returnImage\"");
//sb2.append(newLine);
//sb2.append(newLine);
//sb2.append("false");
//out.write(sb2.toString().getBytes());
byte[] end_data = ("\r\n--" + BOUNDARY + "--\r\n").getBytes();
// 写上结尾标识
out.write(end_data);
out.flush();
out.close();
// 定义BufferedReader输入流来读取URL的响应
BufferedReader reader = new BufferedReader(new InputStreamReader(conn.getInputStream()));
String line = null;
while ((line = reader.readLine()) != null) {
System.out.println(line);
}
} catch (Exception e) {
System.out.println("发送POST请求出现异常！" + e);
e.printStackTrace();
}
}
2、服务器接收端，将文件上床服务器指定位置
package com.dayang.ExcelController;
import com.dayang.ExcelService.FileService;
import com.dayang.dubbo.CreateExcelConsumer;
import com.dayang.util.Result;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.multipart.MultipartFile;
import java.io.IOException;
@RestController
public class FileController {
protected static final Logger logger = LoggerFactory.getLogger(FileController.class);
@Autowired
private CreateExcelConsumer createExcelConsumer;
@Autowired
FileService fileService;
@PostMapping("/uploads")
public String uploads(@RequestParam("file") MultipartFile file,@RequestParam("unid")String unid) throws IOException {
//String unid="444444";
String uploadPath = "";
try{
logger.info("==>uuid: " + unid);
if (file == null) {
logger.error("==> 没有上传文件。");
return Result.error("没有上传文件。");
}
logger.info("==>文件名: " + file.getOriginalFilename());
uploadPath = fileService.handlerMultipartFile(file,unid);
//return Result.success("文件上传完成。", newFileName);
//uploadPath = createExcelConsumer.uploadExcel(file,unid);
logger.info("==>文件路径: " + uploadPath);
}
catch (Exception e){
}
return uploadPath;
}
@RequestMapping("/test")
public String test(){
System.out.println("test测试成功。");
logger.info("==> 测试成功。");
return "test";
}
}
3、service
package com.dayang.ExcelService;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.stereotype.Service;
import org.springframework.web.multipart.MultipartFile;
import java.io.File;
import java.io.FileOutputStream;
import java.io.OutputStream;
@Service
public class FileService {
protected static final Logger logger= LoggerFactory.getLogger(FileService.class);
private String directoryPath = "C:\\Temp";
public FileService() {
File directory = new File(directoryPath);
if (!directory.exists()) {
directory.mkdirs();
}
}
public String handlerMultipartFile(MultipartFile multipartFile ,String unid) {
String fileOldName = multipartFile.getOriginalFilename();
int beginIndex = fileOldName.lastIndexOf(".");
String suffix = fileOldName.substring(beginIndex);
String newFileName = unid+ suffix;
File upFile = new File(directoryPath + "/" + newFileName);
OutputStream outputStream = null;
try {
byte[] fileByte = multipartFile.getBytes();
outputStream = new FileOutputStream(upFile);
outputStream.write(fileByte);
logger.info("<== 文件写出完成: " + newFileName);
return newFileName;
} catch (Exception e) {
logger.error("", e);
} finally {
try {
if (outputStream != null) {
outputStream.flush();
outputStream.close();
}
} catch (Exception e) {
logger.error("", e);
}
}
return directoryPath + "/" + newFileName;
}
}
4、Result
package com.dayang.util;
import com.alibaba.fastjson.JSONObject;
public class Result {
public static String success(String msg, Object result) {
JSONObject jsonObject = new JSONObject();
jsonObject.put("status", 1);
jsonObject.put("message", msg);
jsonObject.put("result", result);
return jsonObject.toJSONString();
}
public static String error(String msg) {
JSONObject jsonObject = new JSONObject();
jsonObject.put("status", -1);
jsonObject.put("message", msg);
return jsonObject.toJSONString();
}
}
以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持脚本之家。