SpringMVC—对Ajax的处理（含 JSON 类型）(2)

这里编写了一个通用的类型转换器：用来转换形如： firstName=jack&lastName=lily&gender=1&foods=Steak&foods=Pizza&quote=Enter+your+favorite+quote!&education=Jr.High&tOfD=Day 到 Student 对象。/*** @author solverpeng* @create 2016-08-22-17:37 */public final class InjectUtil<T> {    private static final Logger LOGGER = LoggerFactory.getLogger(InjectUtil.class);    public static <T> T converter2Obj(String source, Class<T> tClass) {T t = null;        try {t = tClass.newInstance();Map<String, Object> params = new HashMap<String, Object>();            if(source != null && source.length() > 0) {String[] fields = source.split("&");                for(String field : fields) {String[] fieldKeyValue = field.split("\\=");String fieldKey = fieldKeyValue[0];String fieldValue = fieldKeyValue[1];                    if (params.containsKey(fieldKey)) {Object keyValueRetrieved = params.get(fieldKey);                        if (keyValueRetrieved instanceof String) {ArrayList<String> values = new ArrayList<>();values.add(keyValueRetrieved.toString());values.add(fieldValue);params.put(fieldKey, values);} else {((ArrayList<String>) keyValueRetrieved).add(fieldValue);}} else {params.put(fieldKey, fieldValue);}}}BeanUtils.populate(t, params);} catch(InstantiationException | IllegalAccessException | InvocationTargetException e) {e.printStackTrace();LOGGER.error("String convert to Bean failure!", e);}        return t;}}不要忘记在 SpringMVC 中添加自定义的转换器。e3:也可以在 handler 方法中来调用上面我编写的通用的类型转换器来完成解析。@RequestMapping("/testStudent")public String testStudent(@RequestParam("student") String studentStr, String amount) {System.out.println("studentStr:" + studentStr);System.out.println("amount：" + amount);    return "success";
}
说明：对于复杂数据来说，我们借助不了 SpringMVC，只能借助于第三方，或是自己来编写解析器来解析。★多表单一次提交表单数据：<form action="" method="post" id="form2">First Name:<input type="text" name="firstName" maxlength="12" size="12"/> <br/>Last Name:<input type="text" name="lastName" maxlength="36" size="12"/> <br/>Gender:<br/>Male:<input type="radio" name="gender" value="1"/><br/>Female:<input type="radio" name="gender" value="0"/><br/><%–Favorite Food:<br/>Steak:<input type="checkbox" name="foods" value="Steak"/><br/>Pizza:<input type="checkbox" name="foods" value="Pizza"/><br/>Chicken:<input type="checkbox" name="foods" value="Chicken"/><br/>–%><textarea wrap="physical" cols="20" name="quote" rows="5">Enter your favorite quote!</textarea><br/>Select a Level of Education:<br/><select name="education"><option value="Jr.High">Jr.High</option><option value="HighSchool">HighSchool</option><option value="College">College</option></select><br/>Select your favorite time of day:<br/><select size="3" name="tOfD"><option value="Morning">Morning</option><option value="Day">Day</option><option value="Night">Night</option></select><p><input type="submit"/></p></form><form action="" method="post" id="form1">First Name:<input type="text" name="firstName" maxlength="12" size="12"/> <br/>Last Name:<input type="text" name="lastName" maxlength="36" size="12"/> <br/>Gender:<br/>Male:<input type="radio" name="gender" value="1"/><br/>Female:<input type="radio" name="gender" value="0"/><br/><%– Favorite Food:<br/>Steak:<input type="checkbox" name="foods" value="Steak"/><br/>Pizza:<input type="checkbox" name="foods" value="Pizza"/><br/>Chicken:<input type="checkbox" name="foods" value="Chicken"/><br/>–%><textarea wrap="physical" cols="20" name="quote" rows="5">Enter your favorite quote!</textarea><br/>Select a Level of Education:<br/><select name="education"><option value="Jr.High">Jr.High</option><option value="HighSchool">HighSchool</option><option value="College">College</option></select><br/>Select your favorite time of day:<br/><select size="3" name="tOfD"><option value="Morning">Morning</option><option value="Day">Day</option><option value="Night">Night</option></select></form>
e1:同时需要定义一个 Students 类：public class Students {    private List<Student> students;    public List<Student> getStudents() {        return students;}    public void setStudents(List<Student> students) {        this.students = students;}
}请求：$('form').submit(function() {$.ajax({url : "testStudent",data : JSON.stringify({            "students": [$('#form1').serializeObject(),$('#form2').serializeObject()]}),contentType:"application/json;charset=utf-8",type : "post",success : function (result) {console.log(result);}});    return false;
});handler 方法：@RequestMapping("/testStudent")public String testStudent(@RequestBody Students students) {    for(Student student : students.getStudents()) {System.out.println("student:" + student);}    return "success";
}可以正常打印。 e2:不额外增加类，即不定义 Students请求：$('form').submit(function() {$.ajax({url : "testStudent",data : JSON.stringify([$('#form1').serializeObject(),$('#form2').serializeObject()]),contentType:"application/json;charset=utf-8",type : "post",success : function (result) {console.log(result);}});    return false;
});handler 方法：e21:通过数组来接收@RequestMapping("/testStudent")public String testStudent(@RequestBody Student[] students) {    for(Student student : students) {System.out.println("student: " + student);}    return "success";
}e22:通过 List 来接收@RequestMapping("/testStudent")public String testStudent(@RequestBody List<Student> students) {   for(Student student : students) {System.out.println("student: " + student);}   return "success";
}★一个表单多个对象表单对象如：e1:<form action="" method="post" id="form">First Name:<input type="text" name="firstName" maxlength="12" size="12"/> <br/>Last Name:<input type="text" name="lastName" maxlength="36" size="12"/> <br/>Gender:<br/>Male:<input type="radio" name="gender" value="1"/><br/>Female:<input type="radio" name="gender" value="0"/><br/><%–Favorite Food:<br/>Steak:<input type="checkbox" name="foods" value="Steak"/><br/>Pizza:<input type="checkbox" name="foods" value="Pizza"/><br/>Chicken:<input type="checkbox" name="foods" value="Chicken"/><br/>–%><textarea wrap="physical" cols="20" name="quote" rows="5">Enter your favorite quote!</textarea><br/>Select a Level of Education:<br/><select name="education"><option value="Jr.High">Jr.High</option><option value="HighSchool">HighSchool</option><option value="College">College</option></select><br/>Select your favorite time of day:<br/><select size="3" name="tOfD"><option value="Morning">Morning</option><option value="Day">Day</option><option value="Night">Night</option></select>First Name:<input type="text" name="firstName" maxlength="12" size="12"/> <br/>Last Name:<input type="text" name="lastName" maxlength="36" size="12"/> <br/>Gender:<br/>Male:<input type="radio" name="gender" value="1"/><br/>Female:<input type="radio" name="gender" value="0"/><br/><%– Favorite Food:<br/>Steak:<input type="checkbox" name="foods" value="Steak"/><br/>Pizza:<input type="checkbox" name="foods" value="Pizza"/><br/>Chicken:<input type="checkbox" name="foods" value="Chicken"/><br/>–%><textarea wrap="physical" cols="20" name="quote" rows="5">Enter your favorite quote!</textarea><br/>Select a Level of Education:<br/><select name="education"><option value="Jr.High">Jr.High</option><option value="HighSchool">HighSchool</option><option value="College">College</option></select><br/>Select your favorite time of day:<br/><select size="3" name="tOfD"><option value="Morning">Morning</option><option value="Day">Day</option><option value="Night">Night</option></select><p><input type="submit"/></p></form>e2:<form action="" method="post">First Name:<input type="text" name="firstName[0]" maxlength="12" size="12"/> <br/>Last Name:<input type="text" name="lastName[0]" maxlength="36" size="12"/> <br/>Gender:<br/>Male:<input type="radio" name="gender[0]" value="1"/><br/>Female:<input type="radio" name="gender[0]" value="0"/><br/>Favorite Food:<br/>Steak:<input type="checkbox" name="foods[0]" value="Steak"/><br/>Pizza:<input type="checkbox" name="foods[0]" value="Pizza"/><br/>Chicken:<input type="checkbox" name="foods[0]" value="Chicken"/><br/><textarea wrap="physical" cols="20" name="quote[0]" rows="5">Enter your favorite quote!</textarea><br/>Select a Level of Education:<br/><select name="education[0]"><option value="Jr.High">Jr.High</option><option value="HighSchool">HighSchool</option><option value="College">College</option></select><br/>Select your favorite time of day:<br/><select size="3" name="tOfD[0]"><option value="Morning">Morning</option><option value="Day">Day</option><option value="Night">Night</option></select>First Name:<input type="text" name="firstName[1]" maxlength="12" size="12"/> <br/>Last Name:<input type="text" name="lastName[1]" maxlength="36" size="12"/> <br/>Gender:<br/>Male:<input type="radio" name="gender[1]" value="1"/><br/>Female:<input type="radio" name="gender[1]" value="0"/><br/>Favorite Food:<br/>Steak:<input type="checkbox" name="foods[1]" value="Steak"/><br/>Pizza:<input type="checkbox" name="foods[1]" value="Pizza"/><br/>Chicken:<input type="checkbox" name="foods[1]" value="Chicken"/><br/><textarea wrap="physical" cols="20" name="quote[1]" rows="5">Enter your favorite quote!</textarea><br/>Select a Level of Education:<br/><select name="education[1]"><option value="Jr.High">Jr.High</option><option value="HighSchool">HighSchool</option><option value="College">College</option></select><br/>Select your favorite time of day:<br/><select size="3" name="tOfD[1]"><option value="Morning">Morning</option><option value="Day">Day</option><option value="Night">Night</option></select><p><input type="submit"/></p></form>来看经过处理后的数据：e1:（1）JSON.stringify($('form').serializeObject())：{"firstName":["jack","tom"],"lastName":["aa","lily"],"foods":["Steak","Pizza","Steak"],"quote":["Enter your favorite quote!","Enter your favorite quote!"],"education":["Jr.High","Jr.High"],"tOfD":["Day","Day"],"gender":"1"}（2）$('form').serialize()：firstName=jack&lastName=aa&foods=Steak&foods=Pizza&quote=Enter+your+favorite+quote!&education=Jr.High&tOfD=Day&firstName=tom&lastName=lily&gender=1&foods=Steak&quote=Enter+your+favorite+quote!&education=Jr.High&tOfD=Day说明：第一种是无法处理的，没办法分清数组中的值是属于哪个对象的。第二种方式可以处理，但是需要编写自定义的类型转换器，这里不进行说明。有兴趣的童鞋，请自行探索。e2:（1）JSON.stringify($('form').serializeObject()):{"firstName[0]":"aa","lastName[0]":"bb","gender[0]":"1","foods[0]":"Pizza","quote[0]":"Enter your favorite quote!","education[0]":"Jr.High","tOfD[0]":"Day","firstName[1]":"ds","lastName[1]":"cc","gender[1]":"1","foods[1]":["Steak","Pizza"],"quote[1]":"Enter your favorite quote!","education[1]":"Jr.High","tOfD[1]":"Day"}（2）$('form').serialize():firstName%5B0%5D=aa&lastName%5B0%5D=bb&gender%5B0%5D=1&foods%5B0%5D=Pizza&quote%5B0%5D=Enter+your+favorite+quote!&education%5B0%5D=Jr.High&tOfD%5B0%5D=Day&firstName%5B1%5D=ds&lastName%5B1%5D=cc&gender%5B1%5D=1&foods%5B1%5D=Steak&foods%5B1%5D=Pizza&quote%5B1%5D=Enter+your+favorite+quote!&education%5B1%5D=Jr.High&tOfD%5B1%5D=Day说明：第一种看着有规律可循，貌似可以进行解析，但是不是一个标准的 JSON 格式的数据。第二种甚至都出现了乱码，没有想到解析的办法。来看看第一种，同样这里提供一种思路，因为实现起来比较费劲。思路：使用正则like this :Gson gson = new Gson();
String jsonInString = "{\"student[0].firstName\": \"asdf\",\"student[0].lastName\": \"sfd\",\"student[0].gender\": \"1\",\"student[0].foods\":[\"Steak\",\"Pizza\"],\"student[0].quote\": \"Enter your favorite quote!\",\"student[0].education\": \"Jr.High\",\"student[0].tOfD\": \"Day\",\"student[1].firstName\": \"sf\",\"student[1].lastName\": \"sdf\",\"student[1].gender\": \"1\",\"student[1].foods\": [\"Pizza\",\"Chicken\"],\"student[1].quote\": \"Enter your favorite quote!\",\"student[1].education\": \"Jr.High\",\"student[1].tOfD\": \"Night\"}";
String jsonWithoutArrayIndices = jsonInString.replaceAll("\\[\\d\\]", "").replaceAll("student.","");
String jsonAsCollection = "[" + jsonWithoutArrayIndices + "]";
String jsonAsValidCollection = jsonAsCollection.replaceAll(",\"student.firstName\"","},{\"student.firstName\"");
System.out.println(jsonAsValidCollection);
Student[] students = gson.fromJson(jsonAsValidCollection, Student[].class);
System.out.println("-----------------------------------------------");
System.out.println(students[0]);
System.out.println("-----------------------------------------------");