调接口获取文件
- 环境
- 多个文件
-
- 接口
- 压缩工具类
- 一个文件
-
- 接口
环境
其他系统调接口获取一个或多个文件，但是按照平时写的一次只能传输一个文件，多个文件尝试也只能传输第一个，现找到一个方法，即使用压缩文件传输。
多个文件
接口
@RequestMapping(value = "/pickFile")
public String getPickFile(@RequestParam("type") String type, HttpServletRequest request, HttpServletResponse response) {
String baseURL = "D:/pdf/pick/"; // 文件夹服务器上的地址
List<String> fileNameList = xxxx.getPickFilename(type);
if (null != fileNameList && fileNameList.size() > 0) {
String zipName = type + "_pick.zip";
response.setContentType("APPLICATION/OCTET-STREAM");
response.setHeader("Content-Disposition", "attachment; filename=" + zipName);
// 下面两行支持跨域
response.setHeader("Access-Control-Allow-Origin", "*");
response.setHeader("Access-Control-Allow-Method", "POST,GET");
String fileURL = "";
try {
ZipOutputStream out = new ZipOutputStream(response.getOutputStream());
for (String fileName : fileNameList) {
if (StringUtils.isNotBlank(fileName) && !StringUtils.equals("0", fileName)) {
fileURL = baseURL + fileName;
ZipUtils.doCompress(fileURL, out);
response.flushBuffer();
}
}
out.close();
} catch (Exception e) {
e.printStackTrace();
}
}
return null;
}
压缩工具类
压缩使用主要包：
java.util.zip.ZipEntry、java.util.zip.ZipOutputStream
public class ZipUtils {
private static Logger logger = LoggerFactory.getLogger(ZipUtils.class);
private ZipUtils() {
}
/**
* 文件压缩
*
* @param srcFile 目录或者单个文件地址
* @param zipFile 压缩后的ZIP文件地址
*/
public static void doCompress(String srcFile, String zipFile) throws IOException {
doCompress(new File(srcFile), new File(zipFile));
}
/**
* 文件压缩
*
* @param srcFile 目录或者单个文件
* @param zipFile 压缩后的ZIP文件
*/
public static void doCompress(File srcFile, File zipFile) throws IOException {
ZipOutputStream out = null;
try {
out = new ZipOutputStream(new FileOutputStream(zipFile));
doCompress(srcFile, out, "");
} catch (Exception e) {
throw e;
} finally {
out.close();// 记得关闭资源
}
}
/**
* 文件压缩
*
* @param filelName 目录或者单个文件地址
* @param out zip输出流
*/
public static void doCompress(String filelName, ZipOutputStream out) throws IOException {
doCompress(new File(filelName), out, "");
}
/**
* 文件压缩
*
* @param file 目录或者单个文件
* @param out zip输出流
*/
public static void doCompress(File file, ZipOutputStream out) throws IOException {
doCompress(file, out, "");
}
/**
* 文件压缩
*
* @param inFile 目录或者单个文件
* @param out zip输出流
* @param dir 目录路径
*/
public static void doCompress(File inFile, ZipOutputStream out, String dir) throws IOException {
if (inFile.isDirectory()) {
File[] files = inFile.listFiles();
if (files != null && files.length > 0) {
for (File file : files) {
String name = inFile.getName();
if (!"".equals(dir)) {
name = dir + "/" + name;
}
ZipUtils.doCompress(file, out, name);
}
}
} else {
ZipUtils.doZip(inFile, out, dir);
}
}
public static void doZip(File inFile, ZipOutputStream out, String dir) throws IOException {
String entryName = null;
if (!"".equals(dir)) {
entryName = dir + "/" + inFile.getName();
} else {
entryName = inFile.getName();
}
ZipEntry entry = new ZipEntry(entryName);
out.putNextEntry(entry);
int len = 0;
byte[] buffer = new byte[1024];
FileInputStream fis = new FileInputStream(inFile);
while ((len = fis.read(buffer)) > 0) {
out.write(buffer, 0, len);
out.flush();
}
out.closeEntry();
fis.close();
}
public static void doZip(InputStream in, ZipOutputStream out, String entryName) throws IOException {
logger.info("---添加InputStream到压缩文件，InputStream大小：{}", in.available());
ZipEntry entry = new ZipEntry(entryName);
out.putNextEntry(entry);
int len = 0;
byte[] buffer = new byte[1024 * 5];
while ((len = in.read(buffer)) > 0) {
out.write(buffer, 0, len);
out.flush();
}
out.closeEntry();
in.close();
}
public static void main(String[] args) throws IOException {
// doCompress("D:/testFiles", "D:/附件.zip");
}
}
一个文件
接口
@RequestMapping(value = "/pickFile")
public String getReleaseFie(@RequestParam("type") String type, @RequestParam("no") String no,
HttpServletRequest request, HttpServletResponse response) {
try{
PickFile file= xxx.getPick(no, type);
if (null != file) {
String fileName = file.getFileName();
if (StringUtils.isNotBlank(fileName) && !StringUtils.equals("0", fileName)) {
String baseURL = "http://ip:端口号/xxx/"; // 文件所放文件夹链接
String fileURL = baseURL + fileName;
BufferedInputStream bis = null;
BufferedOutputStream bos = null;
// 如果不存在乱码的情况可以忽略，由于请求参数文件名为中文，到后台会乱码，考虑操作系统和客户端浏览器默认编码
// 判断服务器操作系统，本地开发使用windows
String os = System.getProperty("os.name");
if (os.toLowerCase().indexOf("windows") != -1) {
fileName = new String(fileName.getBytes("GBK"), "ISO-8859-1");
} else {
// 判断浏览器
String userAgent = request.getHeader("User-Agent").toLowerCase();
if (userAgent.indexOf("msie") > 0) {
fileName = URLEncoder.encode(fileName, "ISO-8859-1");
}
}
// 响应二进制流
response.setContentType("application/octet-stream");
response.reset();// 清除response中的缓存
// 根据网络文件地址创建URL
URL url = new URL(fileURL);
// 获取此路径的连接
URLConnection conn = url.openConnection();
Long fileLength = conn.getContentLengthLong();// 获取文件大小
// 设置reponse响应头，真实文件名重命名，就是在这里设置，设置编码
response.setHeader("Content-Disposition", "attachment; filename=" + fileName);
response.setHeader("Content-Length", String.valueOf(fileLength));
bis = new BufferedInputStream(conn.getInputStream());// 构造读取流
bos = new BufferedOutputStream(response.getOutputStream());// 构造输出流
byte[] buff = new byte[1024];
int bytesRead;
// 每次读取缓存大小的流，写到输出流
while (-1 != (bytesRead = bis.read(buff, 0, buff.length))) {
bos.write(buff, 0, bytesRead);
}
response.flushBuffer();// 将所有的读取的流返回给客户端
if (null != bis) {
bis.close();
}
if (null != bos) {
bos.close();
}
}
}
} catch (Exception e) {
e.printStackTrace();
}
return null;
}