背景:有时候string类型的数据取出来是个很标准的key、value形式,通过Gson的可以直接转成map
    使用方式:

    1. Gson gson = new Gson();
    2. Map<String, Object> map = new HashMap<String, Object>();
    3. map = gson.fromJson(jsonString, map.getClass());#关键
    4. String goodsid=(String) map.get("goods_id");
    5. System.out.println("map的值为:"+goodsid);

    jsong数据为:

    1. {"goods_id":"140861765","cat_id":"210","goods_sn":"171073501","goods_sn_back":"171073501","goods_upc":null,"goods_name":"Lace-Up Boxer Swimming Trunks"}

    是个很标准的key,value形式,转换后,在使用map分得到key,打印的map为
    java中string类型转换成map - 图1
    Gson的另外一种写法

    1. public static Map<String, Object> json2map(String str_json) {
    2. Map<String, Object> res = null;
    3. try {
    4. Gson gson = new Gson();
    5. res = gson.fromJson(str_json, new TypeToken<Map<String, Object>>() {
    6. }.getType());
    7. } catch (JsonSyntaxException e) {
    8. }
    9. return res;
    10. }

    gson在mavent的配置

    1. <!-- 配置gson -->
    2. <dependency>
    3. <groupId>com.google.code.gson</groupId>
    4. <artifactId>gson</artifactId>
    5. <version>2.2.4</version>
    6. </dependency>