jasperReport的这个包net.sf.jasperreports.engine.design 是这样描述的：
Contains design time implementations for the library's main interfaces as well as report compiling tools.
因此我们完全可以使用它的API构建自己的报表，还是和前几篇使用同一个数据库表。
构建JasperDesign对象：
设置一些对应的属性：
// JasperDesign
JasperDesign jasperDesign = new JasperDesign();
jasperDesign.setName("NoXmlDesignReport");
jasperDesign.setPageWidth(595);
jasperDesign.setPageHeight(842);
jasperDesign.setColumnWidth(515);
jasperDesign.setColumnSpacing(0);
jasperDesign.setLeftMargin(40);
jasperDesign.setRightMargin(40);
jasperDesign.setTopMargin(50);
jasperDesign.setBottomMargin(50);
字体：
// Fonts
JRDesignStyle normalStyle = new JRDesignStyle();
normalStyle.setName("Arial_Normal");
normalStyle.setDefault(true);
normalStyle.setFontName("Arial");
normalStyle.setFontSize(12);
normalStyle.setPdfFontName("Helvetica");
normalStyle.setPdfEncoding("Cp1252");
normalStyle.setPdfEmbedded(false);
jasperDesign.addStyle(normalStyle);
JRDesignStyle boldStyle = new JRDesignStyle();
boldStyle.setName("Arial_Bold");
boldStyle.setFontName("Arial");
boldStyle.setFontSize(12);
boldStyle.setBold(true);
boldStyle.setPdfFontName("Helvetica-Bold");
boldStyle.setPdfEncoding("Cp1252");
boldStyle.setPdfEmbedded(false);
jasperDesign.addStyle(boldStyle);
JRDesignStyle italicStyle = new JRDesignStyle();
italicStyle.setName("Arial_Italic");
italicStyle.setFontName("Arial");
italicStyle.setFontSize(12);
italicStyle.setItalic(true);
italicStyle.setPdfFontName("Helvetica-Oblique");
italicStyle.setPdfEncoding("Cp1252");
italicStyle.setPdfEmbedded(false);
jasperDesign.addStyle(italicStyle);
定义报表的参数，并添加到报表设计器上
// Parameters
JRDesignParameter parameter = new JRDesignParameter();
parameter.setName("ReportTitle");
parameter.setValueClass(java.lang.String.class);
jasperDesign.addParameter(parameter);
定义报表的字段，这些字段是最终显示到报表上的域
// Fields
JRDesignField field = new JRDesignField();
field.setName("userid");
field.setValueClass(java.lang.Integer.class);
jasperDesign.addField(field);
field = new JRDesignField();
field.setName("name");
field.setValueClass(java.lang.String.class);
jasperDesign.addField(field);
field = new JRDesignField();
field.setName("sex");
field.setValueClass(java.lang.String.class);
jasperDesign.addField(field);
field = new JRDesignField();
field.setName("age");
field.setValueClass(java.lang.String.class);
jasperDesign.addField(field);
field = new JRDesignField();
field.setName("password");
field.setValueClass(java.lang.String.class);
jasperDesign.addField(field);
field = new JRDesignField();
field.setName("department");
field.setValueClass(java.lang.String.class);
jasperDesign.addField(field);
JRDesignBand band = null;
JRDesignTextField textField = null;
JRDesignExpression expression = null;
开始画报表主体的title部分，不需要的部分可以不用代码标识出来，title部分放置了报表标题字段，只会出现在第一页的上方
// title
band = new JRDesignBand();
band.setHeight(50);
textField = new JRDesignTextField();
textField.setBlankWhenNull(true);
textField.setX(0);
textField.setY(10);
textField.setWidth(500);
textField.setHeight(30);
textField.setHorizontalAlignment(JRAlignment.HORIZONTAL_ALIGN_CENTER);
textField.setStyle(normalStyle);
textField.setFontSize(22);
expression = new JRDesignExpression();
expression.setValueClass(java.lang.String.class);
expression.setText("$P{ReportTitle}");
textField.setExpression(expression);
band.addElement(textField);
jasperDesign.setTitle(band);
detail部分：排列域的位置，并设置它的值，没一个域的值会最为一个 JRDesignExpression出现
// Detail
// pid
band = new JRDesignBand();
band.setHeight(20);
textField = new JRDesignTextField();
textField.setX(5);
textField.setY(4);
textField.setWidth(100);
textField.setHeight(15);
textField.setHorizontalAlignment(JRAlignment.HORIZONTAL_ALIGN_RIGHT);
textField.setStyle(normalStyle);
expression = new JRDesignExpression();
expression.setValueClass(java.lang.Integer.class);
expression.setText("$F{userid}");
textField.setExpression(expression);
band.addElement(textField);
// name
textField = new JRDesignTextField();
textField.setStretchWithOverflow(true);
textField.setX(120);
textField.setY(4);
textField.setWidth(80);
textField.setHeight(15);
textField.setPositionType(JRElement.POSITION_TYPE_FLOAT);
textField.setStyle(normalStyle);
expression = new JRDesignExpression();
expression.setValueClass(java.lang.String.class);
expression.setText("$F{name}");
textField.setExpression(expression);
band.addElement(textField);
// sex
textField = new JRDesignTextField();
textField.setStretchWithOverflow(true);
textField.setX(200);
textField.setY(4);
textField.setWidth(30);
textField.setHeight(15);
textField.setPositionType(JRElement.POSITION_TYPE_FLOAT);
textField.setStyle(normalStyle);
expression = new JRDesignExpression();
expression.setValueClass(java.lang.String.class);
expression.setText("$F{sex}");
textField.setExpression(expression);
band.addElement(textField);
// age
textField = new JRDesignTextField();
textField.setStretchWithOverflow(true);
textField.setX(240);
textField.setY(4);
textField.setWidth(30);
textField.setHeight(15);
textField.setPositionType(JRElement.POSITION_TYPE_FLOAT);
textField.setStyle(normalStyle);
expression = new JRDesignExpression();
expression.setValueClass(java.lang.String.class);
expression.setText("$F{age}");
textField.setExpression(expression);
band.addElement(textField);
// password
textField = new JRDesignTextField();
textField.setStretchWithOverflow(true);
textField.setX(270);
textField.setY(4);
textField.setWidth(80);
textField.setHeight(15);
textField.setPositionType(JRElement.POSITION_TYPE_FLOAT);
textField.setStyle(normalStyle);
expression = new JRDesignExpression();
expression.setValueClass(java.lang.String.class);
expression.setText("$F{password}");
textField.setExpression(expression);
band.addElement(textField);
// department
textField = new JRDesignTextField();
textField.setStretchWithOverflow(true);
textField.setX(350);
textField.setY(4);
textField.setWidth(80);
textField.setHeight(15);
textField.setPositionType(JRElement.POSITION_TYPE_FLOAT);
textField.setStyle(normalStyle);
expression = new JRDesignExpression();
expression.setValueClass(java.lang.String.class);
expression.setText("$F{department}");
textField.setExpression(expression);
band.addElement(textField);
JasperReport对象可以使用下面这句产生：
JasperCompileManager.compileReport(jasperDesign);
至此一个完整的报表就可以显示出来了。