java org.json.JSONException：JSONArray 文本必须以“[”开头
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org.json.JSONException: A JSONArray text must start with '['
提问by user2320431
I have the following json file:
我有以下 json 文件：
[ { "1" : "b1.png"},
{ "2" : "bb1.png"},
{ "3" : "bbg1.png"}
]
and in the following line:
并在以下行中：
JSONArray array = new JSONArray(jsonFilePath);
I get the following exception:
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.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)
But it is start with '[' !!!
但它以 '[' 开头！！！
Any ideas? Thanks a lot!
有任何想法吗？非常感谢！
回答by August
Create a JSONTokener:
创建一个JSONTokener：
Reader in = new InputStreamReader(new FileInputStream(jsonFilePath), StandardCharsets.UTF_8);
JSONArray array = new JSONArray(new JSONTokener(in));
in.close();
You'll need to handle FileNotFoundExceptionas well.
你也需要处理FileNotFoundException。
回答by dnault
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 IOto read the file:
正如@JaredRummler 建议的那样，您需要先将文件的内容读入一个字符串，然后将该字符串传递给 JSONArray 构造函数。下面是一些使用Apache Commons IO读取文件的示例代码：
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));
