Java 从URL解析JSON

1. 首先，你需要下载URL（作为文本）：

private static String readUrl(String urlString) throws Exception {    BufferedReader reader = null;    try {        URL url = new URL(urlString);        reader = new BufferedReader(new InputStreamReader(url.openStream()));        StringBuffer buffer = new StringBuffer();        int read;        char[] chars = new char[1024];        while ((read = reader.read(chars)) != -1) buffer.append(chars, 0, read);         return buffer.toString();    } finally {        if (reader != null) reader.close();    }}

1. 然后你需要解析它（这里有一些选项）。

GSON（完整示例）：

static class Item {    String title;    String link;    String description;}static class Page {    String title;    String link;    String description;    String language;    List<Item> items;}public static void main(String[] args) throws Exception {    String json = readUrl("http://www.javascriptkit.com/"    + "dhtmltutors/javascriptkit.json");    Gson gson = new Gson(); Page page = gson.fromJson(json, Page.class);    System.out.println(page.title);    for (Item item : page.items)        System.out.println("    " + item.title);}

输出：

javascriptkit.com    document Text Resizer    Javascript Reference- Keyboard/ Mouse Buttons Events    Dynamically loading an external Javascript or CSS file

试试json.org上的Java API ：

try {    JSonObject json = new JSonObject(readUrl("..."));    String title = (String) json.get("title");    ...} catch (JSonException e) {    e.printStackTrace();}