Some coding basics of Java

All base types of non-byte types can be converted to strings through the string.valueof () method

Comparison of non-basic types requires the use of the Equals method

Get parameter values for form submission

1:string name = Request.getparameter (' name ');

Gets the array value of the form submission

1:string[] NameList = request.getparametervalues (' listname ');

Passing parameters to a page

1:request.setattribute (' var ', value);

Session action

1: session.setAttribute('var',value);
2: session.getAttribute('var');
3: session.removeAttribute('var');

Split a string into arrays

1:string[] col= mystr.split (', ');

To determine the length of an array

1:mylist.length;

Converts a string to an integral type

1:integer.parseint (STR);

Output passing values in a JSP page

1: <bean:write name='Obj' property='Id' /> //对象的某个属性
2: <bean:write name='name' />

Map Action Method

1: Map condition= new HashMap();
2: condition.put('name', value);
3: condition.get('name');