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把对象转成JSON。
1.JSON基础语法
2.JSON和java对象之间的转换。
业务逻辑处理完,也需要发送给前端。把java对象转成JSON。
2.1 JSON导入库
实际操作
字符串不能嵌套,所以用转义字符。
2.2 JSON案例 查询所有
Servlet这里如此处理
查到的打包成JSON,发给前台。
brand.html,获取打包过来的brand对象。。
2.3 JSON案例新增品牌
这里的按钮,不用submit,用异步的请求。
addServlet,里面是获取POST方式,数据都在请求体里,JSON就只有一行,所以readline。
如果添加的方法报错,下面的响应成功就不会执行。
addbrand.html里的script。if之前是先发数据到Servlet,然后接受Servlet的响应,对响应数据进行处理。如果是success,就跳转到brand.html。
每一个输入框都有name,即JS对象。
AXios会把他们变成JSON数据。
然后获取输入框的数据。 下面挨个获取value。
这里勾选框的数据不能再直接得到value的值,得检查它得checked属性。checked属性为true,就是被选中。
我们一次性获取两个标签的值,哪个被选中了,就获取它的value值。