java实现图片上传功能，并返回图片保存路径
1、前端html
![]()
2、js
//用于进行图片上传，返回地址
function setImg(obj){
var f=$(obj).val();
alert(f);
console.log(obj);
if(f == null || f ==undefined || f == ''){
return false;
}
if(!/\.(?:png|jpg|bmp|gif|PNG|JPG|BMP|GIF)$/.test(f))
{
alert("类型必须是图片(.png|jpg|bmp|gif|PNG|JPG|BMP|GIF)");
$(obj).val('');
return false;
}
var data = new FormData();
console.log(data);
$.each($(obj)[0].files,function(i,file){
data.append('file', file);
});
console.log(data);
$.ajax({
type: "POST",
url: GLOBAL_INFO.WEBURL_PREFIX+"business/uploadImg.xhtml",
data: data,
cache: false,
contentType: false, //不可缺
processData: false, //不可缺
dataType:"json",
success: function(ret) {
console.log(ret);
if(ret.code==0){
$("#photoUrl").val(ret.result.url);//将地址存储好
$("#photourlShow").attr("src",ret.result.url);//显示图片
alertOk(ret.message);
}else{
alertError(ret.message);
$("#url").val("");
$(obj).val('');
}
},
error: function(XMLHttpRequest, textStatus, errorThrown) {
alert("上传失败，请检查网络后重试");
}
});
}3、后台代码
import java.io.File;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.HashMap;
import java.util.Map;
import java.util.Random;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.ResponseBody;
import org.springframework.web.multipart.MultipartFile;
import com.alibaba.fastjson.JSON;
import com.siyang.CommonUtil.BaseController;
import com.siyang.entity.ResponseResult;
/**
* 照片上传工具类
* @author admin
*
*/
@Controller
@RequestMapping("/business")
public class UploaderController extends BaseController{
@ResponseBody
@RequestMapping("/uploadImg.xhtml")
public void uploadPicture(@RequestParam(value="file",required=false)MultipartFile file,HttpServletRequest request,HttpServletResponse response){
ResponseResult result = new ResponseResult();
Map map = new HashMap();
File targetFile=null;
String url="";//返回存储路径
int code=1;
System.out.println(file);
String fileName=file.getOriginalFilename();//获取文件名加后缀
if(fileName!=null&&fileName!=""){
String returnUrl = request.getScheme() + "://" + request.getServerName() + ":" + request.getServerPort() + request.getContextPath() +"/upload/imgs/";//存储路径
String path = request.getSession().getServletContext().getRealPath("upload/imgs"); //文件存储位置
String fileF = fileName.substring(fileName.lastIndexOf("."), fileName.length());//文件后缀
fileName=new Date().getTime()+"_"+new Random().nextInt(1000)+fileF;//新的文件名
//先判断文件是否存在
SimpleDateFormat sdf = new SimpleDateFormat("yyyyMMdd");
String fileAdd = sdf.format(new Date());
//获取文件夹路径
File file1 =new File(path+"/"+fileAdd);
//如果文件夹不存在则创建
if(!file1 .exists() && !file1 .isDirectory()){
file1 .mkdir();
}
//将图片存入文件夹
targetFile = new File(file1, fileName);
try {
//将上传的文件写到服务器上指定的文件。
file.transferTo(targetFile);
url=returnUrl+fileAdd+"/"+fileName;
code=0;
result.setCode(code);
result.setMessage("图片上传成功");
map.put("url", url);
result.setResult(map);
} catch (Exception e) {
e.printStackTrace();
result.setMessage("系统异常，图片上传失败");
}
}
writeJson(response, result);
}
} 4、结果集实体类
package com.siyang.entity;
import java.util.Map;
public class ResponseResult {
private Integer code;
private String message;
private Map result;
public Integer getCode() {
return this.code;
}
public void setCode(Integer code) {
this.code = code;
}
public String getMessage() {
return this.message;
}
public void setMessage(String message) {
this.message = message;
}
public Map getResult() {
return this.result;
}
public void setResult(Map result) {
this.result = result;
}
}
5、向页面返回结果
package com.siyang.CommonUtil;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.io.PrintWriter;
import javax.servlet.http.HttpServletResponse;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import com.google.gson.Gson;
public class BaseController {
protected Logger logger = LoggerFactory.getLogger(getClass());
/**
* 输出JSON数据
*
* @param response
* @param jsonStr
*/
public void writeJson(HttpServletResponse response, String jsonStr) {
response.setContentType("text/json;charset=utf-8");
response.setHeader("Pragma", "No-cache");
response.setHeader("Cache-Control", "no-cache");
response.setDateHeader("Expires", 0);
PrintWriter pw = null;
try {
pw = response.getWriter();
pw.write(jsonStr);
pw.flush();
} catch (Exception e) {
logger.info("输出JSON数据异常", e);
}finally{
if(pw!=null){
pw.close();
}
}
}
/**
*
* 向页面响应json字符数组串流.
*
* @param response
* @param jsonStr
* @throws IOException
* @return void
*/
public void writeJsonStr(HttpServletResponse response, String jsonStr) throws IOException {
OutputStream outStream = null;
try {
response.reset();
response.setCharacterEncoding("UTF-8");
outStream = response.getOutputStream();
outStream.write(jsonStr.getBytes("UTF-8"));
outStream.flush();
} catch (IOException e) {
logger.info("输出JSON数据异常(writeJsonStr)", e);
} finally {
if(outStream!=null){
outStream.close();
}
}
}
public void writeJsonStr(HttpServletResponse response, InputStream in) throws IOException {
if(null == in ){
return ;
}
OutputStream outStream = null;
try {
response.reset();
response.setCharacterEncoding("UTF-8");
response.setHeader("Pragma", "No-cache");
response.setHeader("Cache-Control", "no-cache");
response.setDateHeader("Expires", 0);
outStream = response.getOutputStream();
int len = 0;
byte[] byt = new byte[1024];
while ((len = in.read(byt)) != -1) {
outStream.write(byt, 0, len);
}
outStream.flush();
} catch (IOException e) {
logger.info("输出JSON数据异常(writeJsonStr)", e);
} finally {
if(outStream!=null){
outStream.close();
in.close();
}
}
}
/**
* 输出JSON数据
*
* @param response
* @param jsonStr
*/
public void writeJson(HttpServletResponse response, Object obj) {
response.setContentType("text/json;charset=utf-8");
response.setHeader("Pragma", "No-cache");
response.setHeader("Cache-Control", "no-cache");
response.setDateHeader("Expires", 0);
PrintWriter pw = null;
Gson gson = new Gson();
try {
pw = response.getWriter();
pw.write(gson.toJson(obj));
pw.flush();
} catch (Exception e) {
logger.info("输出JSON数据异常", e);
}finally{
if(pw!=null){
pw.close();
}
}
}
public void writeHtml(HttpServletResponse response, String html) {
response.setContentType("text/html;;charset=utf-8");
response.setHeader("Pragma", "No-cache");
response.setHeader("Cache-Control", "no-cache");
response.setDateHeader("Expires", 0);
PrintWriter pw = null;
try {
pw = response.getWriter();
pw.write(html);
pw.flush();
} catch (Exception e) {
logger.info("输出HTML数据异常", e);
}finally{
if(pw!=null){
pw.close();
}
}
}
}