这个json怎么用对象解析

给你写出了一种方式，也希望你能以后慢慢独立解决。
最外层定一个一个类，Fees.java

    public class Fees {
        private String code;
        private String action;
        private String title;
        private List<Bill> form;
        public String getCode() {
            return code;
        }
        public void setCode(String code) {
            this.code = code;
        }
        public String getAction() {
            return action;
        }
        public void setAction(String action) {
            this.action = action;
        }
        public String getTitle() {
            return title;
        }
        public void setTitle(String title) {
            this.title = title;
        }
        public List<Bill> getForm() {
            return form;
        }
        public void setForm(List<Bill> form) {
            this.form = form;
        }
    }

第二层的类，Bill.java

    public class Bill {

        private String type;
        private String name;
        private String label;
        private List<Option> options;

        public String getType() {
            return type;
        }
        public void setType(String type) {
            this.type = type;
        }
        public String getName() {
            return name;
        }
        public void setName(String name) {
            this.name = name;
        }
        public String getLabel() {
            return label;
        }
        public void setLabel(String label) {
            this.label = label;
        }
        public List<Option> getOptions() {
            return options;
        }
        public void setOptions(List<Option> options) {
            this.options = options;
        }
    }

最内层类，Option.java

    public class Option {
        private String label;
        private String value;
        private String amount;

        public String getLabel() {
            return label;
        }
        public void setLabel(String label) {
            this.label = label;
        }
        public String getValue() {
            return value;
        }
        public void setValue(String value) {
            this.value = value;
        }
        public String getAmount() {
            return amount;
        }
        public void setAmount(String amount) {
            this.amount = amount;
        }
    }

我们这样来解析：

    import net.sf.json.JSONObject;
    public class Test {
        public static void main(String[] args) {
            String jsonStr = "{\"code\": \" D1_3300_0000\",\"action\": \"prepay\",\"title\": \"缴费 - 浙江电力\",\"form\":[{\"type\": \"bill\",\"name\": \"bill_id\",\"label\": \"您查询账单如下\",\"options\": [{\"label\": \"2013年5月\",\"value\": \"201301011530008001140\",\"amount\": \"13.58\"},{\"label\": \"2013年6月\",\"value\": \"201301011530008001141\",\"amount\": \"23.47\"}]},{\"type\": \"string\",\"label\": \"户名\",\"value\": \"张三\"},{\"type\": \"string\",\"label\": \"地址\",\"value\": \"杭州市西湖区玉泉路201号\"},{\"type\": \"string\",\"label\": \"违约金(元)\",\"value\": \"0\"},{\"type\": \"string\",\"label\": \"总应缴金额(元)\",\"value\": \"30.23\"}]}";

            JSONObject jsonObject = JSONObject.fromObject(jsonStr);
            Fees fee = (Fees) JSONObject.toBean(jsonObject, Fees.class);
            System.out.println("asdf");
        }
    }