org.json.JSONException:JSONArray文本必须以"["开头 [英] org.json.JSONException: A JSONArray text must start with '['

问题描述

我有以下json文件:

I have the following json file:

[   { "1" : "b1.png"},
    { "2" : "bb1.png"},
    { "3" : "bbg1.png"}
]

以及以下行:

JSONArray array = new JSONArray(jsonFilePath);

我收到以下异常:

org.json.JSONException: A JSONArray text must start with '[' at 1 [character 2 line 1]
    at org.json.JSONTokener.syntaxError(JSONTokener.java:433)
    at org.json.JSONArray.<init>(JSONArray.java:105)
    at org.json.JSONArray.<init>(JSONArray.java:144)
    at il.ac.technion.cs234311.dolphins.parse.ParseCardsTest.initialize(ParseCardsTest.java:23)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
    at java.lang.reflect.Method.invoke(Unknown Source)
    at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:47)
    at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
    at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:44)
    at org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:24)
    at org.junit.runners.ParentRunner.run(ParentRunner.java:309)
    at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:50)
    at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)
    at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:459)
    at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:675)
    at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:382)
    at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:192)

但是它以'['!!!

But it is start with '[' !!!

有什么想法吗? 非常感谢！

Any ideas? Thanks a lot!

推荐答案

按照@JaredRummler的建议，您需要先将文件的内容读取到String中，然后将该String传递给JSONArray构造函数.这是一些使用 Apache Commons IO 来读取文件的示例代码:

As @JaredRummler suggested, you need to read the contents of the file into a String first, and then pass that String to the JSONArray constructor. Here's some sample code that uses Apache Commons IO to read the file:

import org.apache.commons.io.IOUtils;

...

public static String readJsonFile(String filename) throws IOException {
    try (InputStream is = new FileInputStream(filename)) {
        return IOUtils.toString(is, StandardCharsets.UTF_8);
    }    
}

....

JSONArray array = new JSONArray(readJsonFile(jsonFilePath));

这篇关于org.json.JSONException:JSONArray文本必须以"["开头的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！