阅读JSON文件错误

Question

我尝试用Java读取JSON文件.代码是:

public static void main(String[] args) throws Exception {
    InputStream is = new FileInputStream("j.txt");
    String jsonTxt = IOUtils.toString( is );

    JSONObject json = (JSONObject) JSONSerializer.toJSON( jsonTxt );

    JSONObject routes = json.getJSONObject("routes");
    JSONObject legs = routes.getJSONObject("legs");
    JSONObject distance = legs.getJSONObject("distance");
    String dist = distance.getString("text");
}

该行JSONObject json = (JSONObject) JSONSerializer.toJSON( jsonTxt );出错:

 Exception in thread "main" java.lang.NoClassDefFoundError: org/apache/commons/lang/exception/NestableRuntimeException
    at java.lang.ClassLoader.defineClass1(Native Method)
    at java.lang.ClassLoader.defineClassCond(ClassLoader.java:632)
    at java.lang.ClassLoader.defineClass(ClassLoader.java:616)
    at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:141)
    at java.net.URLClassLoader.defineClass(URLClassLoader.java:283)
    at java.net.URLClassLoader.access$000(URLClassLoader.java:58)
    at java.net.URLClassLoader$1.run(URLClassLoader.java:197)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.net.URLClassLoader.findClass(URLClassLoader.java:190)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:307)
    at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:248)
    at antmedic.algorithm.SimpleParser.main(SimpleParser.java:24)
 Caused by: java.lang.ClassNotFoundException: org.apache.commons.lang.exception.NestableRuntimeException
    at java.net.URLClassLoader$1.run(URLClassLoader.java:202)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.net.URLClassLoader.findClass(URLClassLoader.java:190)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:307)
    at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:248)
    ... 13 more
Java Result: 1

我很感激解决这个问题.

Answer 1

最新版本的Commons Lang(目前为3.1)的包名为org.apache.commons.lang3而不是org.apache.commons.lang.对于后来的软件包名称(如您的情况),您应该下载2.6版本的Commons Lang.

Answer 2

听起来你在类路径中没有apache commons jar文件