《jsonlib的使用.docxVIP

lizhaojun永恒的召唤God Loves The World博客园首页博问闪存新随笔联系订阅管理随笔-70 文章-1 评论-1 Json-lib使用——JSONObject与JSONArray1.从Object到String要先用Object对象构造一个JSONObject或者JSONArray对象，然后调用它的toString()方法即可（1）示例一1 Book book=newBook();2book.setName(Java);3book.setPrice(52.3f);4JSONObject object=JSONObject.fromObject(book);5System.out.println(object.toString());（2）示例二 1 Book book=new Book(); 2book.setName(Java); 3book.setPrice(52.3f); 4 5 Book book2=new Book(); 6 book2.setName(C); 7 book2.setPrice(42.3f); 8 List list=newArrayList(); 9list.add(book);10list.add(book2);11JSONArrayarry=JSONArray.fromObject(list);12System.out.println(arry.toString());13//结果如下：14 [{name:Java,price:52.3},{name:C,price:42.3}]2.从String到Object要先用String对象构造一个JSONObject或者JSONArray对象(1)示例一1 String json={name:Java,price:52.3}; 2JSONObject object=JSONObject.fromObject(json);3System.out.println(object.get(name)+ +object.get(price));(2)示例二1 String json=[{name:Java,price:52.3},{name:C,price:42.3}];2JSONArray array=JSONArray.fromObject(json);3for(inti=0;iarray.size();i++){4 Map o=(Map)array.get(i);5System.out.println(o.get(name)+ +o.get(price));6 }3.从String到Bean(1)单个Bean对象1 String json={name:Java,price:52.3};2JSONObject object=JSONObject.fromObject(json);3 Product product=(Product)JSONObject.toBean(object,Product.class);4System.out.println(product.getName()+ +product.getPrice());(2).Bean的数组1 String json=[{name:Java,price:52.3},{name:C,price:42.3}];2JSONArray array=JSONArray.fromObject(json);3 Product[] products=(Product[]) JSONArray.toArray(array,Product.class);4for(Product p:products){5System.out.println(p.getName()+ +p.getPrice());6 }自定义封装JSON操作的类 1packagecom.util; 2 3importjava.util.List; 4importjava.util.Map; 5 6importnet.sf.json.JSONArray; 7importnet.sf.json.JSONObject; 8 9publicclassJsonHelper {10//从普通的Bean转换为字符串11publicstatic String getJson(Object o){12JSONObjectjo=JSONObject.fromObject(o);13returnjo.toString();14 }15//从Java的列