response 中OutputStream和PrintWriter区别

https://blog.csdn.net/feipeng8848/article/details/56286399

https://blog.csdn.net/lhanson/article/details/83893999

https://blog.csdn.net/qq_16605855/article/details/78260355

public class RenderUtil {/*** 渲染json对象*/public static void renderJson(HttpServletResponse response, Object jsonObject) {try {response.setContentType("application/json");response.setCharacterEncoding("UTF-8");PrintWriter writer = response.getWriter();writer.write(JSON.toJSONString(jsonObject));} catch (IOException e) {throw new MsApiException("响应异常",1);}}
}

 /*** 模板下载* * @param name*/@ApiOperation(value = "模板下载", notes = "模板下载")@ApiImplicitParams({@ApiImplicitParam(paramType = "query", dataType = "String", name = "id", value = "主键", required = true) })@GetMapping(value = "/downloadtemplate")public void downLoadTemplate(@RequestParam(value = "id", required = true) String id, HttpServletResponse response,HttpServletRequest request) {try {TemplateInfo templateInfo = this.iTemplateInfoService.getById(id);if (templateInfo != null) {String parentDir = null;try {parentDir = this.getClass().getClassLoader().getResource("").getPath();} catch (Exception e) {log.error("读取根路径报错", e);}String path = parentDir + templateInfo.getTemplateUrl();String fileName = templateInfo.getName() + ".xlsx";String userAgent = request.getHeader("USER-AGENT");if (StringUtils.contains(userAgent, "MSIE")) {// IE浏览器fileName = URLEncoder.encode(fileName, "UTF8");} else if (StringUtils.contains(userAgent, "Mozilla")) {// google,火狐浏览器fileName = new String(fileName.getBytes(), "ISO8859-1");} else {fileName = URLEncoder.encode(fileName, "UTF8");// 其他浏览器}// 以流的形式下载文件。InputStream fis = new BufferedInputStream(new FileInputStream(path));// 清空responseresponse.reset();// 设置response的Headerresponse.setCharacterEncoding("UTF-8");response.addHeader("Content-Disposition", "attachment;filename=" + fileName);response.addHeader("Content-Length", "" + fis.available());response.setContentType("application/octet-stream");int len = 0;byte[] buffer = new byte[1024];OutputStream out = response.getOutputStream();while ((len = fis.read(buffer)) > 0) {// 将缓冲区的数据输出到客户端浏览器out.write(buffer, 0, len);}fis.close();out.flush();out.close();}} catch (Exception ex) {ex.printStackTrace();}}/*** excel导入* * @param file* @param response*/@ApiOperation(value = "excel导入", notes = "excel导入")@ApiImplicitParams({@ApiImplicitParam(name = "file", value = "单个文件", paramType = "formData", required = true, dataType = "file"),@ApiImplicitParam(name = "id", value = "id", paramType = "query", required = true, dataType = "String") })@PostMapping(value = "/exporttemplate", headers = "content-type=multipart/form-data")public void exportTemplate(@RequestParam(value = "id", required = true) String id,@RequestParam(value = "file", required = true) MultipartFile file, HttpServletRequest request,HttpServletResponse response) {try {// 一.使用EasyPoi获取文件数据ImportParams params = new ImportParams();params.setHeadRows(1);params.setNeedVerfiy(true); // 设置验证支持// 二.获取excel中的数据，封装成了一个结果对象(有很多东西)ExcelImportResult<ImportStreetTypeVO> result = ExcelImportUtil.importExcelMore(file.getInputStream(),ImportStreetTypeVO.class, params);// 三.获到正确的数据，并把它们保存到数据库List<ImportStreetTypeVO> list = result.getList();List<PeopleBy> peopleByList = Lists.newLinkedList();if (CollectionUtils.isNotEmpty(list)) {list.forEach(e -> {PeopleBy peopleBy = new PeopleBy();try {BeanUtils.copyProperties(e, peopleBy);} catch (IllegalAccessException e1) {e1.printStackTrace();} catch (InvocationTargetException e1) {e1.printStackTrace();}peopleBy.setCreated(new Date());if (Integer.valueOf(id) == 1) {peopleBy.setByRType(5);} else if (Integer.valueOf(id) == 2) {peopleBy.setByRType(4);}peopleByList.add(peopleBy);});this.iPeopleByService.saveBatch(peopleByList);}// 四.如果有错误，把错误数据返回到前台(让前台下载一个错误的excel)// 4.1判断是否有错误if (result.isVerfiyFail()) {// 4.2拿到错误的文件薄Workbook failWorkbook = result.getFailWorkbook();// 把这个文件导出response.setContentType("application/vnd.openxmlformats-officedocument.spreadsheetml.sheet"); // mime类型response.setHeader("Content-disposition", "attachment;filename=error.xlsx"); // 告诉浏览下载的是一个附件，名字叫做error.xlsxresponse.setHeader("Pragma", "No-cache");// 设置不要缓存OutputStream ouputStream = response.getOutputStream();failWorkbook.write(ouputStream);ouputStream.flush();ouputStream.close();}} catch (Exception e) {log.error("excel导入出错", e);}}

 /*** 从阿里云下载附件* * @author ljj* @param response* @param request*/@ResponseBody@RequestMapping(value = "/downloadFromOss", method = RequestMethod.GET)public void downloadFromOss(HttpServletResponse response, HttpServletRequest request) {try {String fileid = request.getParameter("id");if (StringUtils.isBlank(fileid)) {return;}// 记录下载日志WebBaseContext webBaseContext = WebBaseUtils.getBaseContext();SecurityUserDetails securityUserDetails = webBaseContext.getSecurityUserDetails();fileOpatatorLogService.recordDownloadFileOparatorLog("", "", fileid,securityUserDetails == null ? "" : securityUserDetails.getUserAccount());List<Map<String, Object>> fileList = this.iOrganizationBizc.queryFileInfoByFileId(fileid);if (fileList.isEmpty()) {response.sendRedirect(request.getContextPath() + "/405.jsp");return;}String fileStr = "";String ossfilekey = "";if (fileList.size() > 0) {fileStr = fileList.get(0).get("NAME") + "." + fileList.get(0).get("FILE_TYPE");ossfilekey = XfxtUtils.getMapString(fileList.get(0), "STOR_ADDR");}String aliyunId = ApplicationPropertyUtils.getContextProperty("ALIYUN_ACCESS_KEY_ID");String aliyunSecret = ApplicationPropertyUtils.getContextProperty("ALIYUN_ACCESS_KEY_SECRET");String ossEndpoint = ApplicationPropertyUtils.getContextProperty("ALIYUN_OSS_ENDPOINT");response.reset();setExportHeader(request, response, fileStr, 2);OSSClient ossClient = new OSSClient(ossEndpoint, aliyunId, aliyunSecret);// 获取fileid对应的阿里云上的文件对象OSSObject ossObject = ossClient.getObject(ApplicationPropertyUtils.getContextProperty("ALIYUN_OSS_BUCKET"),ossfilekey);// bucketName需要自己设置// 读去Object内容 返回BufferedInputStream in = new BufferedInputStream(ossObject.getObjectContent());BufferedOutputStream out = new BufferedOutputStream(response.getOutputStream());byte[] car = new byte[1024];int l = 0;while ((l = in.read(car)) != -1) {out.write(car, 0, l);}if (out != null) {out.flush();out.close();}if (in != null) {in.close();}ossClient.shutdown();} catch (OSSException e) {e.printStackTrace();} catch (ClientException e) {e.printStackTrace();} catch (UnsupportedEncodingException e) {e.printStackTrace();} catch (IOException e) {e.printStackTrace();}}/*** 设置导出文件名乱码问题* @Title: setExportHeader   * @param: @param request request请求信息* @param: @param response response返回信息* @param: @param fileName 文件名称* @param: @param type  文件类型 1 excel* @author: lijiwei * @date:   2017年11月7日 下午8:04:18*/public static void setExportHeader(HttpServletRequest request, HttpServletResponse response, String fileName, int type){try{String contentType = null;switch (type) {case 1:contentType = "application/msexcel;";break;case 2:contentType = "application/octet-stream;";break;default:contentType = "application/msexcel;";break;}response.setContentType(contentType+"charset=UTF-8");String userAgent = request.getHeader("User-Agent").toLowerCase();if (userAgent.indexOf("firefox") > 0) {fileName = new String(fileName.getBytes("UTF-8"), "ISO8859-1"); // firefox浏览器} else if (userAgent.indexOf("msie") > 0 || userAgent.indexOf("trident") > 0 || userAgent.indexOf("edge") > 0) {fileName = URLEncoder.encode(fileName, "UTF-8");// IE浏览器} else if (userAgent.indexOf("chrome") > 0) {fileName = new String(fileName.getBytes("UTF-8"), "ISO8859-1");// 谷歌} else {fileName = new String(fileName.getBytes("UTF-8"), "ISO8859-1");}response.setHeader("Content-Disposition","attachment;" + " filename=" + fileName);}catch(Exception e){e.printStackTrace();}}

package com.awj.mall.modular.down.controller;import java.io.InputStream;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.Map;
import java.util.zip.ZipEntry;
import java.util.zip.ZipOutputStream;import javax.annotation.Resource;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;import org.apache.commons.lang3.StringUtils;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
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.ResponseBody;import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONArray;
import com.aliyun.oss.OSSClient;
import com.aliyun.oss.model.OSSObject;
import com.awj.mall.core.base.controller.BaseController;
import com.awj.mall.core.util.OssClientFactory;
import com.awj.mall.modular.goods.model.GoodsLib;
import com.awj.mall.modular.goods.service.IGoodsLibService;/*** * @author ljj 文件从oss批量下载zip**/
@Controller
@RequestMapping("/ossdownload")
public class OssDownLoadController extends BaseController {@Resourceprivate IGoodsLibService iGoodsLibService;private Log log = LogFactory.getLog(this.getClass());@RequestMapping(value = "/ossdownloadtozip", method = RequestMethod.GET)public void ossDownLoadToZip(String goodsId, HttpServletResponse response, HttpServletRequest request) {GoodsLib goodsLib = this.iGoodsLibService.selectById(goodsId);Map<String, InputStream> fileMap = new LinkedHashMap<String, InputStream>();if (goodsLib != null) {String goodsFile = goodsLib.getGoodsFile();if (StringUtils.isNotBlank(goodsFile)) {List<FileObject> fileObjects = null;try {fileObjects = JSONArray.parseArray(goodsFile, FileObject.class);} catch (Exception e) {}OSSClient ossClient = OssClientFactory.getOssClient();if (fileObjects != null) {fileObjects.forEach(fileObject -> {String value = fileObject.getValue();String name = fileObject.getName();int fileIndex = value.indexOf(OssClientFactory.endpointchange)+ OssClientFactory.endpointchange.length() + 1;// 获取fileid对应的阿里云上的文件对象OSSObject ossObject = ossClient.getObject(OssClientFactory.bucketName,value.substring(fileIndex));// bucketName需要自己设置// 读去Object内容 返回fileMap.put(name, ossObject.getObjectContent());});}}}try {// 03:开始将下载下来的文件流,写入到压缩包中,并使用浏览器方式下载:String downloadZipFileName = "产品附件.zip"; // 压缩包名字:ZipOutputStream out = new ZipOutputStream(response.getOutputStream());// --设置成这样可以不用保存在本地，再输出，// 通过response流输出,直接输出到客户端浏览器中。if (request.getHeader("User-Agent").toLowerCase().indexOf("firefox") > 0) {downloadZipFileName = new String(downloadZipFileName.getBytes("GB2312"), "ISO-8859-1");} else {// 对压缩包文件名进行编码处理中文问题downloadZipFileName = java.net.URLEncoder.encode(downloadZipFileName, "UTF-8");downloadZipFileName = new String(downloadZipFileName.getBytes("UTF-8"), "GBK");}response.reset(); // 重点突出response.setCharacterEncoding("UTF-8"); // 重点突出response.setContentType("application/x-msdownload");// 不同类型的文件对应不同的MIME类型 // 重点突出// 设置下载方式:// inline : 在浏览器中直接显示，不提示用户下载; -- 默认为inline方式// attachment : 弹出对话框，提示用户进行下载保存本地response.setHeader("Content-Disposition", "attachment;filename=" + downloadZipFileName);for (Map.Entry<String, InputStream> entry : fileMap.entrySet()) {// 文件名:String fileName = entry.getKey();// 文件流:InputStream in = entry.getValue();out.putNextEntry(new ZipEntry(fileName));int len;byte[] buf = new byte[4096];while ((len = in.read(buf)) > 0) {out.write(buf, 0, len);}out.closeEntry();in.close();}out.close();} catch (Exception e) {e.printStackTrace();log.error("压缩成zip失败", e);}}static class FileObject {private String value;private String name;public String getValue() {return value;}public void setValue(String value) {this.value = value;}public String getName() {return name;}public void setName(String name) {this.name = name;}}}

try {logger.info("【BillCommonFileServiceImpl】 download ==begin "+filePath);final String aliUrl="";//访问oss上文件的http://*。。。。aliyuncs.com/需要替换掉  直接是filePath=filePath.replaceAll(aliUrl,"");String[] split = filePath.split("/");String fileName= URLDecoder.decode(split[split.length-1],"UTF-8");//阿里的key值  utf8// 从阿里云进行下载//bucketName需要自己设置OSSClient client =createOSSClient();OSSObject ossObject = client.getObject(aliyunOSSConfig.getBucket(),filePath);// 已缓冲的方式从字符输入流中读取文本，缓冲各个字符，从而提供字符、数组和行的高效读取BufferedReader reader = new BufferedReader(new InputStreamReader(ossObject.getObjectContent()));InputStream inputStream = ossObject.getObjectContent();//缓冲文件输出流BufferedOutputStream outputStream=new BufferedOutputStream(response.getOutputStream());//通知浏览器以附件形式下载// response.setHeader("Content-Disposition","attachment;filename="+ URLEncoder.encode(fileName,"UTF-8"));// 为防止 文件名出现乱码response.setContentType("application/doc");final String userAgent = request.getHeader("USER-AGENT");if(StringUtils.contains(userAgent, "MSIE")){//IE浏览器fileName = URLEncoder.encode(fileName,"UTF-8");}else if(StringUtils.contains(userAgent, "Mozilla")){//google,火狐浏览器fileName = new String(fileName.getBytes(), "ISO8859-1");}else{fileName = URLEncoder.encode(fileName,"UTF-8");//其他浏览器}response.addHeader("Content-Disposition", "attachment;filename=" +fileName);//这里设置一下让浏览器弹出下载提示框，而不是直接在浏览器中打开logger.info("【BillCommonFileServiceImpl】 download ==end "+filePath);// 进行解码 如果上传时为了防止乱码 进行解码使用此方法BASE64Decoder base64Decoder = new BASE64Decoder();
//            byte[] car;
//            while (true) {
//                String line = reader.readLine();
//                if (line == null) break;
//                car =  base64Decoder.decodeBuffer(line);
//
//                outputStream.write(car);
//            }
//            reader.close();byte[] car = new byte[1024];int L;while((L = inputStream.read(car)) != -1){if (car.length!=0){outputStream.write(car, 0,L);}}if(outputStream!=null){outputStream.flush();outputStream.close();}if (client !=null){client.shutdown();}} catch (IOException e) {logger.error("【BillCommonFileServiceImpl】 download ==IOException "+e.getMessage());e.printStackTrace();} catch (OSSException e){logger.error("【BillCommonFileServiceImpl】 download ==OSSException "+e.getMessage());}

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