$.post("checkemail.do",{email:$("#txtEmail").val()},function(data){
if(data.ok){
$("#email_info").text("*换个把，这个有人用了");
div=false;
}else{
$("#email_info_ok").text("√这个可以");
div=true;
}
},
"json"
);

private String email;
private boolean ok;
public String execute() throws Exception {
UserDao dao = (UserDao) DaoFactory.getInstance("UserDao");
try {
if(dao.valiEmail(email)){
ok = true;
}else {
ok = false;
}
} catch (SQLException e){
e.printStackTrace();
throw new Exception();
}
return "success";
}
public String getEmail() {
return email;
}
public void setEmail(String email) {
this.email = email;
}
public boolean isOk() {
return ok;
}
public void setOk(boolean ok) {
this.ok = ok;
}

jquery和struts2，data是json格式返回，所以data.ok可以直接得到值