作为服务端

最好要设置编码方式的解析,url的解析

作为客户端

下载url需要取请求服务端
如果是浏览器访问的话,相当于浏览器帮你做了url的encode是可以下载的
如果用代码的话,一般如下:

  1. public static String downLoadFromUrl(String urlStr, String fileName, String savePath) {
  2.         try {
  3.             URL url = new URL(urlStr);
  4.             HttpURLConnection conn = (HttpURLConnection) url.openConnection();
  5.             // 设置超时间为30秒
  6.             conn.setConnectTimeout(60 * 1000);
  7.             // 防止屏蔽程序抓取而返回403错误
  8.             conn.setRequestProperty("User-Agent", "Mozilla/4.0 (compatible; MSIE 5.0; Windows NT; DigExt)");
  9.             // 得到输入流
  10.             InputStream inputStream = conn.getInputStream();
  11.             // 获取自己数组
  12.             byte[] getData = readInputStream(inputStream);
  14.             // 文件保存位置
  15.             File saveDir = new File(savePath);
  16.             if (!saveDir.exists()) {
  17.                 saveDir.mkdir();
  18.             }
  19.             File file = new File(saveDir + File.separator + fileName);
  20.             FileOutputStream fos = new FileOutputStream(file);
  21.             fos.write(getData);
  22.             if (fos != null) {
  23.                 fos.close();
  24.             }
  25.             if (inputStream != null) {
  26.                 inputStream.close();
  27.             }
  28.             return saveDir + File.separator + fileName;
  29.         } catch (Exception e) {
  30.             e.printStackTrace();
  31.         }
  32.         return "";
  33.     }

第十行会报错FileNotFound.类似这样

  1. java.io.FileNotFoundException: http://www.zzgcjyzx.com:8087/Front/AttachStorage/202101/J070/ff6ee790-137a-4807-bab0-6622339e0321/[E3506010601800136042001]国泰新点测试项目20210118新接口测试项目-1.ZZZF
  2.     at sun.net.www.protocol.http.HttpURLConnection.getInputStream0(HttpURLConnection.java:1896)
  3.     at sun.net.www.protocol.http.HttpURLConnection.getInputStream(HttpURLConnection.java:1498)
  4.     at com.dfit.api.junziqian.service.SignFileUtils.downLoadFromUrl(SignFileUtils.java:29)
  5.     at com.dfit.api.basic.controller.ProcessControllerTest.t2(ProcessControllerTest.java:55)
  6.     at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
  7.     at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
  8.     at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
  9.     at java.lang.reflect.Method.invoke(Method.java:498)
  10.     at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:59)
  11.     at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
  12.     at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:56)
  13.     at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)
  14.     at org.junit.runners.ParentRunner$3.evaluate(ParentRunner.java:306)
  15.     at org.junit.runners.BlockJUnit4ClassRunner$1.evaluate(BlockJUnit4ClassRunner.java:100)
  16.     at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:366)
  17.     at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:103)
  18.     at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:63)
  19.     at org.junit.runners.ParentRunner$4.run(ParentRunner.java:331)
  20.     at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:79)
  21.     at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:329)
  22.     at org.junit.runners.ParentRunner.access$100(ParentRunner.java:66)
  23.     at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:293)
  24.     at org.junit.runners.ParentRunner$3.evaluate(ParentRunner.java:306)
  25.     at org.junit.runners.ParentRunner.run(ParentRunner.java:413)
  26.     at org.junit.runner.JUnitCore.run(JUnitCore.java:137)
  27.     at com.intellij.junit4.JUnit4IdeaTestRunner.startRunnerWithArgs(JUnit4IdeaTestRunner.java:68)
  28.     at com.intellij.rt.junit.IdeaTestRunner$Repeater.startRunnerWithArgs(IdeaTestRunner.java:33)
  29.     at com.intellij.rt.junit.JUnitStarter.prepareStreamsAndStart(JUnitStarter.java:230)
  30.     at com.intellij.rt.junit.JUnitStarter.main(JUnitStarter.java:58)

解决办法

方法1:url特殊部分进行encode

  1. @Test
  2.     public void t3() throws Exception {
  3.         String a = "http://www.zzgcjyzx.com:8087/Front/AttachStorage/202101/J070/ff6ee790-137a-4807-bab0-6622339e0321/";
  4.         String b = "[E3506010601800136042001]国泰新点测试项目20210118新接口测试项目-1.ZZZF";
  5.         String realUrl=a+URLEncoder.encode(b,"UTF-8");
  6.         System.out.println(realUrl);
  7.         String fileName = StringUtils.substringAfterLast(urls,"/");
  8.         SignFileUtils.downLoadFromUrl(realUrl, fileName, fileDir);
  9.     }

方法2:用http直接请求

hutool请求

  1. String urls = "http://www.zzgcjyzx.com:8087/Front/AttachStorage/202101/J070/ff6ee790-137a-4807-bab0-6622339e0321/[E3506010601800136042001]国泰新点测试项目20210118新接口测试项目-1.ZZZF";
  2. String fileDir = "d:/filestore/";
  4.     @Test
  5.     public void t1() throws Exception {
  6.         String fileName = StringUtils.substringAfterLast(urls,"/");
  7.         HttpUtil.downloadFile(urls, fileDir+fileName);
  8.     }

总结

两种思路都有一定局限性
方法1好像不知道特殊的符号在哪里
方法2暂时还不知道有啥问题
方法1优化:

  1. HuTool URLUtil的方法可以帮我们对url进行转义
  2. public static String normalize(String url, boolean isEncodePath) {
  3.         if (StrUtil.isBlank(url)) {
  4.             return url;
  5.         }
  6.         final int sepIndex = url.indexOf("://");
  7.         String protocol;
  8.         String body;
  9.         if (sepIndex > 0) {
  10.             protocol = StrUtil.subPre(url, sepIndex + 3);
  11.             body = StrUtil.subSuf(url, sepIndex + 3);
  12.         } else {
  13.             protocol = "http://";
  14.             body = url;
  15.         }
  17.         final int paramsSepIndex = StrUtil.indexOf(body, '?');
  18.         String params = null;
  19.         if (paramsSepIndex > 0) {
  20.             params = StrUtil.subSuf(body, paramsSepIndex);
  21.             body = StrUtil.subPre(body, paramsSepIndex);
  22.         }
  24.         if (StrUtil.isNotEmpty(body)) {
  25.             // 去除开头的\或者/
  26.             //noinspection ConstantConditions
  27.             body = body.replaceAll("^[\\\\/]+", StrUtil.EMPTY);
  28.             // 替换多个\或/为单个/
  29.             body = body.replace("\\", "/").replaceAll("//+", "/");
  30.         }
  32.         final int pathSepIndex = StrUtil.indexOf(body, '/');
  33.         String domain = body;
  34.         String path = null;
  35.         if (pathSepIndex > 0) {
  36.             domain = StrUtil.subPre(body, pathSepIndex);
  37.             path = StrUtil.subSuf(body, pathSepIndex);
  38.         }
  39.         if (isEncodePath) {
  40.             path = encode(path);
  41.         }
  42.         return protocol + domain + StrUtil.nullToEmpty(path) + StrUtil.nullToEmpty(params);
  43.     }

在方法1放url的地方,对url部分进行转义即可,还是同事老哥厉害