用CppCMS实现web site并同时支持json_rpc服务
刘怀宇
1.将cppcms-0.99.10/examples/json_rpc/rpc.cpp文件中的json_service类拷贝到
examples/templates/hello-tmpl.cpp 中
2.修改hello-tmpl.cpp 中的main函数，添加两个服务
int main(int argc,char ** argv)
{
try {
cppcms::service srv(argc,argv);
srv.applications_pool().mount(cppcms::applications_factory<my_hello_world>() , cppcms::mount_point(std::string("/html")) );
srv.applications_pool().mount(cppcms::applications_factory<json_service>() , cppcms::mount_point(std::string("/jsonrpc")) );
srv.run();
}
catch(std::exception const &e) {
std::cerr<<e.what()<<std::endl;
}
}
3.修改config.js 文件,添加 script_names : /jsonrpc , /html
{
"service" : {
"api" : "http",
"port" : 8080
},
"http" : {
"script_names" : ["/jsonrpc","/html"]
}
}
4.在first.tmpl 中使用如下的html文本 替换掉原来的html
<html>
<body>
<script type="text/javascript">
function call() {
var xhr = new XMLHttpRequest();
xhr.open("post", 'http://localhost:8080/jsonrpc');
// Required by JSON-RPC over HTTP
xhr.setRequestHeader("Content-Type","application/json");
// It is better to use real formatter like JSON.js
x=parseInt(document.getElementById('x').value);
y=parseInt(document.getElementById('y').value);
var request = '{"method":"div","params":[' + x + ',' + y +'],"id":1}';
xhr.onreadystatechange = function() {
if (xhr.readyState === 4) {
res = 'Unknown Error';
if(xhr.status === 200) {
// Don't call eval in real code use some parser
var result = eval('(' + xhr.responseText + ')');
if(result.error==null) {
res = result.result;
}
else {
res = result.error;
}
}
document.getElementById('result').innerHTML = res;
}
}
xhr.send(request);
return false;
}
</script>
<form onsubmit="return call();">
<p>
<input type="text" id="x" />
<input type="submit" value="/" />
<input type="text" id="y" /> =
<span id="result"></span>
</p>
</form>
</body>
</html>
5.make
6. 执行生成的hello-tmpl ./hello-tmpl -c config.js
7. 访问http://localhost:8080/html 在返回的html页面中计算除法，即可成功访问后台的json服务，得到结果
8.注意，IE6不支持JSON_RPC技术。