Question

这是我的代码：

Gson gson = new Gson();
String path = "C:\\Users\\UserName\\Desktop\\Jsons\\myfile.json";
String url = "http://file:///C:/Users/UserName/Desktop/myPage.html"; // Should I remove http:// ?
String json = readFile(path, StandardCharsets.UTF_8);

HttpClient httpClient = HttpClientBuilder.create().build();
HttpPost post = new HttpPost(url);
StringEntity jsonEntity = new StringEntity(json);
post.setEntity(jsonEntity);
post.setHeader("Content-type", "application/json");
HttpResponse response = httpClient.execute(post);

System.out.println(response);

readFile()方法在这里（我从另一个stackoverflow回答得到）：

public static String readFile(String path, Charset encoding) throws IOException {
        byte[] encoded = Files.readAllBytes(Paths.get(path));
        return new String(encoded, encoding);
}

我有一个名为＆＃34; myPage.html＆＃34;的小html文件。它有一个表单，它接受一个json输入并调用另一个生成另一个json文件的站点。如果我在浏览器中打开我的html文件并粘贴输入json并点击提交，我将获得输出json。所以html工作得很好，但是当我尝试在java中这样做时，它不起作用。我一直收到这个错误：

Exception in thread "main" java.net.UnknownHostException: file
    at java.net.Inet6AddressImpl.lookupAllHostAddr(Native Method)
    at java.net.InetAddress$2.lookupAllHostAddr(Unknown Source)
    at java.net.InetAddress.getAddressesFromNameService(Unknown Source)
    at java.net.InetAddress.getAllByName0(Unknown Source)
    at java.net.InetAddress.getAllByName(Unknown Source)
    at java.net.InetAddress.getAllByName(Unknown Source)
    at org.apache.http.impl.conn.SystemDefaultDnsResolver.resolve(SystemDefaultDnsResolver.java:45)
    at org.apache.http.impl.conn.DefaultHttpClientConnectionOperator.connect(DefaultHttpClientConnectionOperator.java:112)
    at org.apache.http.impl.conn.PoolingHttpClientConnectionManager.connect(PoolingHttpClientConnectionManager.java:359)
    at org.apache.http.impl.execchain.MainClientExec.establishRoute(MainClientExec.java:381)
    at org.apache.http.impl.execchain.MainClientExec.execute(MainClientExec.java:237)
    at org.apache.http.impl.execchain.ProtocolExec.execute(ProtocolExec.java:185)
    at org.apache.http.impl.execchain.RetryExec.execute(RetryExec.java:89)
    at org.apache.http.impl.execchain.RedirectExec.execute(RedirectExec.java:111)
    at org.apache.http.impl.client.InternalHttpClient.doExecute(InternalHttpClient.java:185)
    at org.apache.http.impl.client.CloseableHttpClient.execute(CloseableHttpClient.java:83)
    at org.apache.http.impl.client.CloseableHttpClient.execute(CloseableHttpClient.java:108)
    at org.apache.http.impl.client.CloseableHttpClient.execute(CloseableHttpClient.java:56)
    at newTest.newDriver.main(newDriver.java:46)

我查了一下stackoverflow，我发现文件字符串应该有三个正斜杠，但是我的文件字符串已经有了，但这并不起作用。

更新＃1：如果我按你说的做，我现在得到这个例外：

Exception in thread "main" org.apache.http.client.ClientProtocolException: URI does not specify a valid host name: C:/Users/Username/Desktop/myPage.html
    at org.apache.http.impl.client.CloseableHttpClient.determineTarget(CloseableHttpClient.java:95)
    at org.apache.http.impl.client.CloseableHttpClient.execute(CloseableHttpClient.java:83)
    at org.apache.http.impl.client.CloseableHttpClient.execute(CloseableHttpClient.java:108)
    at org.apache.http.impl.client.CloseableHttpClient.execute(CloseableHttpClient.java:56)
    at newTest.newDriver.main(newDriver.java:46)

更新＃2：这是我的html文件myPage.html。

<form method="POST" action="https://backend.hera.potentiaco.com/simavg">
    <textarea name="s" cols="160" rows="40"></textarea><br><br>
    <input type="submit">
</form>

我的myfile.json有一些乱码，比如＆＃34; sdfg＆＃34;。如果我将此内容粘贴到上面的html页面并点击提交，我会得到类似的内容：

{
    "error": "illegal value"
}

但是我无法在我的java文件中重现同样的事情。

Answer 1

是的，您的网址应该String url = "C:/Users/UserName/Desktop/myPage.html";更改并再次发布您的例外

为什么我在发布json时遇到java未知主机异常？

1 个答案: