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ajax参数传递与后台接收

Servlet中读取http参数的方法

Enumeration getParameterNames() 返回一个 String 对象的枚举，包含在该请求中包含的参数的名称

String getParameter(String name) 以字符串形式返回请求参数的值，或者如果参数不存在则返回 null。

String getQueryString() 返回包含在路径后的请求 URL 中的查询字符串。

String[] getParameterValues(String name) 返回一个字符串对象的数组，包含所有给定的请求参数的值，如果参数不存在则返回 null。

ServletInputStream getInputStream() 使用 ServletInputStream，以二进制数据形式检索请求的主体。

ajax默认contentType为application/x-www-form-urlencoded

使用默认contentType，参数追加到url后传递

$.ajax({

url: "http://localhost:8082/boot/request/parameter?name=aaa&paraB=bbb",

contentType: "application/x-www-form-urlencoded;charset=utf-8",

success: function(json){

console.log(json);

}

});

//请求中包含的参数的名称

Enumeration parameterNames = request.getParameterNames();

while (parameterNames.hasMoreElements()) {

String s = parameterNames.nextElement();

System.out.println("getParameterNames:" + s);

String paraA = request.getParameter(s);

System.out.println("getParameter:" + paraA);

}

// 返回包含在路径后的请求 URL 中的查询字符串

String queryString = request.getQueryString();

System.out.println("getQueryString:" + queryString);

使用默认contentType，参数放到data中传递

$.ajax({

url: "http://localhost:8082/boot/request/parameter",

contentType: "application/x-www-form-urlencoded;charset=utf-8",

data: {name: "aaa", paraB:"bbb"},

success: function(json){

console.log(json);

}

});

//请求中包含的参数的名称

Enumeration parameterNames = request.getParameterNames();

while (parameterNames.hasMoreElements()) {

String s = parameterNames.nextElement();

System.out.println("getParameterNames:" + s);

String paraA = request.getParameter(s);

System.out.println("getParameter:" + paraA);

}

使用默认contentType，data中传递数组

$.ajax({

url: "http://localhost:8082/boot/request/parameter",

type: "post",

contentType: "application/x-www-form-urlencoded;charset=utf-8",

data: {foo: ["bar1", "bar2"]},

success: function (json) {

console.log(json);

}

});

// 返回一个字符串对象的数组

String[] parameterValues = request.getParameterValues("foo[]");

if (parameterValues != null) {

for (String parameterValue : parameterValues) {

System.out.println("getParameterValues:" + parameterValue);

}

}

使用contentType为application/json，在data中传递复杂参数

$.ajax({

url: "http://localhost:8082/boot/request/parameter",

type: "post",

contentType: "application/json;charset=utf-8",

data: JSON.stringify({name: "aaa", foo: ["bar1", "bar2"]}),

success: function (json) {

console.log(json);

}

});

// 以二进制数据形式检索请求的主体

ServletInputStream inputStream = request.getInputStream();

BufferedReader br = new BufferedReader(new InputStreamReader(inputStream));

String line = "";

StringBuilder sb = new StringBuilder();

while ((line = br.readLine()) != null) {

sb.append(line);

}

System.out.println("getInputStream:" + sb);

使用contentType为application/json，在data中传递复杂参数，并使用springmvc接收

$.ajax({

url: "http://localhost:8082/boot/request2/requestBody",

type: "post",

contentType: "application/json;charset=utf-8",

data: JSON.stringify({id: 111, name: "aaa", foo: ["bar1", "bar2"]}),

success: function (json) {

console.log(json);

}

});

@RequestMapping(value = "/requestBody")

public void RequestBody(@RequestBody User user) throws IOException {

System.out.println(user.toString());

}

url追加参数与data中放json同时使用

$.ajax({

// url: "http://localhost:8082/boot/request/parameter?userName=aaa",

url: "http://localhost:8082/boot/request2/parm?userName=aaa",

type: "post",

contentType: "application/json;charset=utf-8",

data: JSON.stringify({id: 111, name: "aaa", foo: ["bar1", "bar2"]}),

async:false,

success: function (json) {

console.log(json);

}

});

//请求中包含的参数的名称

Enumeration parameterNames = request.getParameterNames();

while (parameterNames.hasMoreElements()) {

String s = parameterNames.nextElement();

System.out.println("getParameterNames:" + s);

String paraA = request.getParameter(s);

System.out.println("getParameter:" + paraA);

}

// 以二进制数据形式检索请求的主体

ServletInputStream inputStream = request.getInputStream();

BufferedReader br = new BufferedReader(new InputStreamReader(inputStream));

String line = "";

StringBuilder sb = new StringBuilder();

while ((line = br.readLine()) != null) {

sb.append(line);

}

System.out.println("getInputStream:" + sb);

@RequestMapping(value = "/parm")

public void parm(@RequestParam String userName, @RequestBody User user) throws IOException {

System.out.println("userName:" + userName);

System.out.println(user.toString());

}