在json字元串轉java bean時,一般的對象,可以直接轉,如:一個學生類,屬性有姓名、年齡等
Java代碼
- public class Student implements java.io.Serializable{
- private static final long serialVersionUID = -1943961352036134112L;
- private String sname;
- private Integer age;
- public String getSname() {
- return sname;
- }
- public void setSname(String sname) {
- this.sname = sname;
- }
- public Integer getAge() {
- return age;
- }
- public void setAge(Integer age) {
- this.age = age;
- }
- }
由字元串轉java bean時可以使用以下方法:
Java代碼
- JSONObject jobj = JSONObject.fromObject(str);
- Student s = (Student) JSONObject.tobean(jobj,Student.class);
是沒有問題的,但是如果屬性中含有複雜的類型,當其中屬性有類似List , Map ,ArrayList、自定義的類型,如List<Teacher> teachers, 就不可以了。 會報錯:MorphDynaBean cannot be cast to con.test……
在JSONObject.toBean的時候如果轉換的類中有集合,可以先定義Map<String, Class> classMap = new HashMap<String, Class>();在classMap中put你要轉換的類中的集合名,像:classMap.put("teachers", Teacher.class);然後在toBean()的時候把參數加上, 像:Student student=(Student) JSONObject.toBean(str, Student.class, classMap);
比如我定義了如下類型:
Java代碼
- import java.util.List;
- public class AnalysisModel implements java.io.Serializable{
- private List<Condition> regularCondtionList;//
- private List<ConditionField> dynamicConFieldList;
- private List<ResultField> resultField;
- private Integer topnum;
- private String sortFlag;
- private String remark;
- private String modelName;
- private String fileName;
- public List<Condition> getRegularCondtionList() {
- return regularCondtionList;
- }
- public void setRegularCondtionList(List<Condition> regularCondtionList) {
- this.regularCondtionList = regularCondtionList;
- }
- public List<ConditionField> getDynamicConFieldList() {
- return dynamicConFieldList;
- }
- public void setDynamicConFieldList(List<ConditionField> dynamicConFieldList) {
- this.dynamicConFieldList = dynamicConFieldList;
- }
- public Integer getTopnum() {
- return topnum;
- }
- public void setTopnum(Integer topnum) {
- this.topnum = topnum;
- }
- public String getSortFlag() {
- return sortFlag;
- }
- public void setSortFlag(String sortFlag) {
- this.sortFlag = sortFlag;
- }
- public String getRemark() {
- return remark;
- }
- public void setRemark(String remark) {
- this.remark = remark;
- }
- public String getModelName() {
- return modelName;
- }
- public void setModelName(String modelName) {
- this.modelName = modelName;
- }
- public List<ResultField> getResultField() {
- return resultField;
- }
- public void setResultField(List<ResultField> resultField) {
- this.resultField = resultField;
- }
- public String getFileName() {
- return fileName;
- }
- public void setFileName(String fileName) {
- this.fileName = fileName;
- }
- }
在轉化的時候需要這樣來寫:
Java代碼
- Map<String, Class> classMap = new HashMap<String, Class>();
- classMap.put("regularCondtionList", Condition.class);
- classMap.put("dynamicConFieldList", ConditionField.class);
- classMap.put("resultField", ResultField.class);
- AnalysisModel analysisModel=(AnalysisModel) JSONObject.toBean(str, AnalysisModel.class, classMap);