根据第三方提供的图片或pdf的url进行预览

 1 package com.hailian.modules.credit.common.controller; 2 ?3 import java.io.BufferedInputStream; 4 import java.io.File; 5 import java.io.FileInputStream; 6 import java.io.IOException; 7 import java.io.OutputStream; 8 import java.io.UnsupportedEncodingException; 9 import java.net.URL;10 11 import javax.servlet.http.HttpServletResponse;12 13 import com.hailian.component.base.BaseProjectController;14 import com.hailian.jfinal.component.annotation.ControllerBind;15 import com.hailian.modules.credit.utils.FileTypeUtils;16 import com.jfinal.kit.PropKit;17 @ControllerBind(controllerKey = "/credit/commonFile")18 public class FileViewAndUpController extends BaseProjectController{19 ????public void previewFileOnline() {20 ????????HttpServletResponse response = getResponse();21 ????????BufferedInputStream bis = null;22 ????????OutputStream os = null;23 ????????try {24 ????????????String path = getPara("url");//url地址25 ????????????path=new String(getPara("url").getBytes("iso8859-1"),"utf-8");26 ????????????String type = getPara("type");//获取类型27 ????????????response.reset(); // 非常重要28 ????????????response.setContentType("text/html; charset=UTF-8");29 ????????????????if(!FileTypeUtils.isImg(type)){30 ????????????????????response.setContentType("application/pdf");31 ????????????????}else{32 ????????????????????response.setContentType("image/jpeg");33 ????????????????}34 ????????????????URL url =new URL(path);35 ????????????????????bis = new BufferedInputStream(url.openStream());36 ????????????????os = response.getOutputStream();37 ????????????????int count = 0;38 ????????????????byte[] buffer = new byte[1024 * 1024];39 ????????????????while ((count =bis.read(buffer)) != -1){40 ????????????????????os.write(buffer, 0,count);41 ????????????????}42 ????????????????os.flush();43 ????????}catch (Exception e) {44 ????????????e.printStackTrace();45 ????????????if (os !=null){46 ????????????????try {47 ????????????os.close();48 ????????} catch (IOException e2) {49 ????????????e2.printStackTrace();50 ????????}51 ????????????}52 ????????????if (bis !=null){53 ????????????????try {54 ????????????bis.close();55 ????????} catch (IOException e2) {56 ????????????e2.printStackTrace();57 ????????}58 ????????????}59 ????????} finally {60 ????????????????if (os !=null){61 ????????????????????try {62 ????????????????os.close();63 ????????????} catch (IOException e) {64 ????????????????e.printStackTrace();65 ????????????}66 ????????????????}67 ????????????????if (bis !=null){68 ????????????????????try {69 ????????????????bis.close();70 ????????????} catch (IOException e) {71 ????????????????e.printStackTrace();72 ????????????}73 ????????????????}74 ????????????}75 ????}76 }