java实现Multipart/form-data
maven
新的maven和先前的版本的API不同
<dependency>
<groupId>org.apache.httpcomponents</groupId>
<artifactId>httpmime</artifactId>
<version>4.5.3</version>
</dependency>
上传
package uploadTest; import java.io.File; import java.io.IOException; import java.nio.charset.Charset; import java.util.HashMap; import java.util.Map; import java.util.Set; import org.apache.http.Consts; import org.apache.http.HttpEntity; import org.apache.http.client.ClientProtocolException; import org.apache.http.client.methods.CloseableHttpResponse; import org.apache.http.client.methods.HttpPost; import org.apache.http.entity.ContentType; import org.apache.http.entity.mime.MultipartEntityBuilder; import org.apache.http.entity.mime.content.FileBody; import org.apache.http.entity.mime.content.StringBody; import org.apache.http.impl.client.CloseableHttpClient; import org.apache.http.impl.client.HttpClients; import org.apache.http.util.EntityUtils; import org.slf4j.Logger; import org.slf4j.LoggerFactory; public class UploadTest { public static Map<String,Object> uploadFileByHTTP(File postFile,String postUrl,Map<String,String> postParam){ Logger log = LoggerFactory.getLogger(UploadTest.class); Map<String,Object> resultMap = new HashMap<String,Object>(); CloseableHttpClient httpClient = HttpClients.createDefault(); try{ //把一个普通参数和文件上传给下面这个地址 是一个servlet HttpPost httpPost = new HttpPost(postUrl); //把文件转换成流对象FileBody FileBody fundFileBin = new FileBody(postFile); //设置传输参数 MultipartEntityBuilder multipartEntity = MultipartEntityBuilder.create(); multipartEntity.addPart(postFile.getName(), fundFileBin);//相当于<input type="file" name="media"/> //设计文件以外的参数 Set<String> keySet = postParam.keySet(); for (String key : keySet) { //相当于<input type="text" name="name" value=name> multipartEntity.addPart(key, new StringBody(postParam.get(key), ContentType.create("text/plain", Consts.UTF_8))); } HttpEntity reqEntity = multipartEntity.build(); httpPost.setEntity(reqEntity); log.info("发起请求的页面地址 " + httpPost.getRequestLine()); //发起请求 并返回请求的响应 CloseableHttpResponse response = httpClient.execute(httpPost); try { log.info("----------------------------------------"); //打印响应状态 //log.info(response.getStatusLine()); resultMap.put("statusCode", response.getStatusLine().getStatusCode()); //获取响应对象 HttpEntity resEntity = response.getEntity(); if (resEntity != null) { //打印响应长度 log.info("Response content length: " + resEntity.getContentLength()); //打印响应内容 resultMap.put("data", EntityUtils.toString(resEntity,Charset.forName("UTF-8"))); } //销毁 EntityUtils.consume(resEntity); } catch (Exception e) { e.printStackTrace(); } finally { response.close(); } } catch (ClientProtocolException e1) { e1.printStackTrace(); } catch (IOException e1) { e1.printStackTrace(); } finally{ try { httpClient.close(); } catch (IOException e) { e.printStackTrace(); } } log.info("uploadFileByHTTP result:"+resultMap); return resultMap; } //测试 public static void main(String args[]) throws Exception { //要上传的文件的路径 String filePath = "d:/test0.jpg"; String postUrl = "http://localhost:8080/v1/contract/addContract.do"; Map<String,String> postParam = new HashMap<String,String>(); postParam.put("shopId", "15"); File postFile = new File(filePath); Map<String,Object> resultMap = uploadFileByHTTP(postFile,postUrl,postParam); System.out.println(resultMap); } }
接收
@Path("addContract.do")
@Consumes(MediaType.MULTIPART_FORM_DATA)
@Produces(MediaType.TEXT_HTML)
public String addContract(@Context HttpServletRequest request, @Context HttpServletResponse response){
try{
//这里根据业务做修改
Contract contract = new Contract();
//重点是调用saveFile方法
UploadResult uploadResult = saveFile(request);
contract.setShopId(Integer.valueOf(uploadResult.getParamMap().get("shopId")));
contract.setContractUrl(uploadResult.getFilePath());
Boolean success = contractService.addContract(contract);
return JSON.toJSONString(RespApi.buildResp(200, "success", success));
} catch (ContractExeption contractExeption) {
log.warn(ExceptionUtils.getStackTrace(contractExeption));
return JSON.toJSONString(RespApi.buildResp(400, "fail to add contract", false));
}
}
public UploadResult saveFile(HttpServletRequest request) {
Map<String,String> resultMap = new HashMap<>();
String fileName = "";
try {
if (ServletFileUpload.isMultipartContent(request)) {
FileItemFactory factory = new DiskFileItemFactory();
//如果没以下两行设置的话，上传大的 文件 会占用 很多内存，
//设置暂时存放的 存储室 , 这个存储室，可以和 最终存储文件 的目录不同
/**
* 原理 它是先存到 暂时存储室，然后在真正写到 对应目录的硬盘上，
* 按理来说 当上传一个文件时，其实是上传了两份，第一个是以 .tem 格式的
* 然后再将其真正写到 对应目录的硬盘上
*/
//这个tempDir需要自己设置
File tempF = new File(tempDir);
if (!tempF.exists()) {
tempF.mkdirs();
}
factory.setRepository(tempF);
//设置 缓存的大小，当上传文件的容量超过该缓存时，直接放到 暂时存储室
factory.setSizeThreshold(1024 * 1024);
//高水平的API文件上传处理
ServletFileUpload upload = new ServletFileUpload(factory);
List<FileItem> items = null;
try {
items = upload.parseRequest(request);
} catch (FileUploadException e) {
e.printStackTrace();
}
if (items != null) {
Iterator<FileItem> iter = items.iterator();
while (iter.hasNext()) {
FileItem item = iter.next();
//属性字段
if (item.isFormField()) {
//获取表单的属性名字
String name = item.getFieldName();
String value = item.getString();
resultMap.put(name,value);
}
//文件
if (!item.isFormField() && item.getSize() > 0) {
//可以得到流
InputStream in = item.getInputStream();
fileName = processFileName(item.getName());
try {
String basePath = getRootPath();
String types = "pic";
String date = DateUtil.getNowDateStr(DateUtil.TO_DAY);
String realPath = basePath + File.separator + types + File.separator + date
+ File.separator;
//String realPath = basePath + File.separator + types + File.separator + date
// + File.separator;
System.out.println(realPath);
File file1 = new File(realPath);
if (!file1.exists()) {
file1.mkdirs();
}
String name = UUID.randomUUID().toString() + ".jpg";
fileName = types + File.separator + date + File.separator + name;
File files = new File(realPath + name);
item.write(files);
} catch (Exception e) {
e.printStackTrace();
}
}
}
}
}
} catch (Exception e) {
}
UploadResult uploadResult = new UploadResult();
uploadResult.setFilePath(fileName);
uploadResult.setParamMap(resultMap);
return uploadResult;
}
//返回结果的包装类
public class UploadResult {
private String filePath;
private Map<String,String> paramMap;
public String getFilePath() {
return filePath;
}
public void setFilePath(String filePath) {
this.filePath = filePath;
}
public Map<String, String> getParamMap() {
return paramMap;
}
public void setParamMap(Map<String, String> paramMap) {
this.paramMap = paramMap;
}
}
