Java Exeception get inputStream from connection 404 responce和file not found异常？

我想尝试从android studio中的简历下载一个文件，我已经用OpenStream尝试了我的代码，没有任何问题，但在以下代码中：

public void startStream2(Context context) {
    try {
        URL url = new URL(file.getFileUrl());
        StrictMode.ThreadPolicy ploicy = new StrictMode.ThreadPolicy.Builder().permitAll().build();
        StrictMode.setThreadPolicy(ploicy);
        URLConnection connection = url.openConnection();
        int downloaded = 0;
        BufferedOutputStream bout;
        f = new File(downloadPath, file.getName());
        if (f.exists()) {
            downloaded = (int) f.length();
            connection.setRequestProperty("Range", "bytes=" + (f.length()) + "-");
        }
        connection.setDoInput(true);
        connection.setDoOutput(true);
        connection.setRequestProperty("User-Agent","Mozilla/5.0 ( compatible ) ");
        connection.setRequestProperty("Accept","*/*");
        connection.connect();

        int response=((HttpURLConnection)connection).getResponseCode();
        Log.e(TAG, "startStream2: "+ response );
        if (response>399 && response<601){
            InputStreamReader sr;
            sr = new InputStreamReader(((HttpURLConnection) connection).getErrorStream(), "UTF-8");
            StringBuilder builder = new StringBuilder();
            for (int bt = 0; (bt = sr.read()) != -1;) {
                builder.append((char)bt);
            }
            sr.close();
            Log.e(TAG, "startStream2: "+builder.toString());
        }
        InputStream inp=connection.getInputStream();
        BufferedInputStream in = new BufferedInputStream(inp);
        stream2 = (downloaded == 0) ? new FileOutputStream(f) : new FileOutputStream(f, true);
        bout = new BufferedOutputStream(stream2, 1024);
        byte[] data = new byte[1024];
        int x = 0;
        while ((x = in.read(data, 0, 1024)) >= 0) {
            bout.write(data, 0, x);
            downloaded += x;
            int percent = ((int) downloaded * 100) / (int) Size;
            //set percent progress
        }
    }catch (Exception e){
        Log.e(TAG, "startStream2: ",e );
    }
}

public void startStream2(Context context) {
try {
    URL url = new URL(file.getFileUrl());
    StrictMode.ThreadPolicy ploicy = new StrictMode.ThreadPolicy.Builder().permitAll().build();
    StrictMode.setThreadPolicy(ploicy);
    URLConnection connection = url.openConnection();
    int downloaded = 0;
    BufferedOutputStream bout;
    f = new File(downloadPath, file.getName());
    if (f.exists()) {
        downloaded = (int) f.length();
        connection.setRequestProperty("Range", "bytes=" + (f.length()) + "-");
    }
    connection.setDoInput(true);
    connection.setRequestProperty("User-Agent","Mozilla/5.0 ( compatible ) ");
    connection.setRequestProperty("Accept","*/*");

    int response=((HttpURLConnection)connection).getResponseCode();
    Log.e(TAG, "startStream2: "+ response );
    if (response>399 && response<601){
        InputStreamReader sr;
        sr = new InputStreamReader(((HttpURLConnection) connection).getErrorStream(), "UTF-8");
        StringBuilder builder = new StringBuilder();
        for (int bt = 0; (bt = sr.read()) != -1;) {
            builder.append((char)bt);
        }
        sr.close();
        Log.e(TAG, "startStream2: "+builder.toString());
    }
    InputStream inp=connection.getInputStream();
    BufferedInputStream in = new BufferedInputStream(inp);
    stream2 = (downloaded == 0) ? new FileOutputStream(f) : new FileOutputStream(f, true);
    bout = new BufferedOutputStream(stream2, 1024);
    byte[] data = new byte[1024];
    int x = 0;
    while ((x = in.read(data, 0, 1024)) >= 0) {
        bout.write(data, 0, x);
        downloaded += x;
        int percent = ((int) downloaded * 100) / (int) Size;
        //set percent progress
    }
}catch (Exception e){
    Log.e(TAG, "startStream2: ",e );
}
}

public void startStream2（上下文）{
试一试{
URL URL=新URL（file.getFileUrl（））；
StrictMode.ThreadPolicy ploicy=新StrictMode.ThreadPolicy.Builder（）.permitAll（）.build（）；
StrictMode.setThreadPolicy（ploice）；
URLConnection=url.openConnection（）；
int=0；
缓冲输出流；
f=新文件（下载路径，File.getName（））；
如果（f.exists（））{
下载=（int）f.length（）；
setRequestProperty（“范围”、“字节数=“+（f.length（））+”-”；
}
connection.setDoInput（true）；
connection.setDoOutput（真）；
setRequestProperty（“用户代理”，“Mozilla/5.0（兼容）”）；
connection.setRequestProperty（“接受”，“*/*”）；
connection.connect（）；
int response=（（HttpURLConnection）connection.getResponseCode（）；
Log.e（标签“startStream2:+响应”）；
如果（响应>399&&response=0）{
写（数据，0，x）；
下载+=x；
整数百分比=（（整数）下载*100）/（整数）大小；
//设置进度百分比
}
}捕获（例外e）{
Log.e（标签“startStream2:”，e）；
}
}

错误日志：

startStream2:405 startStream2: 405不允许 405不允许

---

nginx

startStream2： java.io.FileNotFoundException： 在 com.android.okhttp.internal.huc.HttpURLConnectionImpl.getInputStream（HttpURLConnectionImpl.java:242）

我以前测试过url，从first或resume下载时没有任何问题。 我如何解决它？ 谢谢。

删除这些行

connection.setDoInput(true);
connection.setDoOutput(true);

问题就在这里。它将HTTP谓词从GET更改为POST。你不想发帖。您没有发送任何输出。移除它

如果响应代码不是200，则不应获取输入流，否则它将引发异常。如果需要更多信息，可以获取错误流，但此时没有输入流

您还可以删除

connection.connect();

及

---

他们不会做任何尚未发生的事情。

最后，我用以下代码解决了这个问题：

public void startStream2(Context context) {
    try {
        URL url = new URL(file.getFileUrl());
        StrictMode.ThreadPolicy ploicy = new StrictMode.ThreadPolicy.Builder().permitAll().build();
        StrictMode.setThreadPolicy(ploicy);
        URLConnection connection = url.openConnection();
        int downloaded = 0;
        BufferedOutputStream bout;
        f = new File(downloadPath, file.getName());
        if (f.exists()) {
            downloaded = (int) f.length();
            connection.setRequestProperty("Range", "bytes=" + (f.length()) + "-");
        }
        connection.setDoInput(true);
        connection.setDoOutput(true);
        connection.setRequestProperty("User-Agent","Mozilla/5.0 ( compatible ) ");
        connection.setRequestProperty("Accept","*/*");
        connection.connect();

        int response=((HttpURLConnection)connection).getResponseCode();
        Log.e(TAG, "startStream2: "+ response );
        if (response>399 && response<601){
            InputStreamReader sr;
            sr = new InputStreamReader(((HttpURLConnection) connection).getErrorStream(), "UTF-8");
            StringBuilder builder = new StringBuilder();
            for (int bt = 0; (bt = sr.read()) != -1;) {
                builder.append((char)bt);
            }
            sr.close();
            Log.e(TAG, "startStream2: "+builder.toString());
        }
        InputStream inp=connection.getInputStream();
        BufferedInputStream in = new BufferedInputStream(inp);
        stream2 = (downloaded == 0) ? new FileOutputStream(f) : new FileOutputStream(f, true);
        bout = new BufferedOutputStream(stream2, 1024);
        byte[] data = new byte[1024];
        int x = 0;
        while ((x = in.read(data, 0, 1024)) >= 0) {
            bout.write(data, 0, x);
            downloaded += x;
            int percent = ((int) downloaded * 100) / (int) Size;
            //set percent progress
        }
    }catch (Exception e){
        Log.e(TAG, "startStream2: ",e );
    }
}

public void startStream2(Context context) {
try {
    URL url = new URL(file.getFileUrl());
    StrictMode.ThreadPolicy ploicy = new StrictMode.ThreadPolicy.Builder().permitAll().build();
    StrictMode.setThreadPolicy(ploicy);
    URLConnection connection = url.openConnection();
    int downloaded = 0;
    BufferedOutputStream bout;
    f = new File(downloadPath, file.getName());
    if (f.exists()) {
        downloaded = (int) f.length();
        connection.setRequestProperty("Range", "bytes=" + (f.length()) + "-");
    }
    connection.setDoInput(true);
    connection.setRequestProperty("User-Agent","Mozilla/5.0 ( compatible ) ");
    connection.setRequestProperty("Accept","*/*");

    int response=((HttpURLConnection)connection).getResponseCode();
    Log.e(TAG, "startStream2: "+ response );
    if (response>399 && response<601){
        InputStreamReader sr;
        sr = new InputStreamReader(((HttpURLConnection) connection).getErrorStream(), "UTF-8");
        StringBuilder builder = new StringBuilder();
        for (int bt = 0; (bt = sr.read()) != -1;) {
            builder.append((char)bt);
        }
        sr.close();
        Log.e(TAG, "startStream2: "+builder.toString());
    }
    InputStream inp=connection.getInputStream();
    BufferedInputStream in = new BufferedInputStream(inp);
    stream2 = (downloaded == 0) ? new FileOutputStream(f) : new FileOutputStream(f, true);
    bout = new BufferedOutputStream(stream2, 1024);
    byte[] data = new byte[1024];
    int x = 0;
    while ((x = in.read(data, 0, 1024)) >= 0) {
        bout.write(data, 0, x);
        downloaded += x;
        int percent = ((int) downloaded * 100) / (int) Size;
        //set percent progress
    }
}catch (Exception e){
    Log.e(TAG, "startStream2: ",e );
}
}

public void startStream2（上下文）{
试一试{
URL URL=新URL（file.getFileUrl（））；
StrictMode.ThreadPolicy ploicy=新StrictMode.ThreadPolicy.Builder（）.permitAll（）.build（）；
StrictMode.setThreadPolicy（ploice）；
URLConnection=url.openConnection（）；
int=0；
缓冲输出流；
f=新文件（下载路径，File.getName（））；
如果（f.exists（））{
下载=（int）f.length（）；
setRequestProperty（“范围”、“字节数=“+（f.length（））+”-”；
}
connection.setDoInput（true）；
setRequestProperty（“用户代理”，“Mozilla/5.0（兼容）”）；
connection.setRequestProperty（“接受”，“*/*”）；
int response=（（HttpURLConnection）connection.getResponseCode（）；
Log.e（标签“startStream2:+响应”）；
如果（响应>399&&response=0）{
写（数据，0，x）；
下载+=x；
整数百分比=（（整数）下载*100）/（整数）大小；
//设置进度百分比
}
}捕获（例外e）{
Log.e（标签“startStream2:”，e）；
}
}

---

非常感谢

我发送属性它需要做输出不需要？不需要。如果要调用

getOutputStream（）

并向其写入内容，您只需要

setDoOutput（true）

。我想这意味着这个答案解决了这个问题。如果有不同的解决方案，你应该把它贴在这里为他人的利益。你应该考虑支持和/或接受你在这里找到有用的答案。这不提供任何解释，而只是重复其他已经回答的问题。